Bump to FontAwesome5, add Mastodon link

content/styles/fa/_animated.scss

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+// Animated Icons
+// --------------------------
+
+.#{$fa-css-prefix}-spin {
+  animation: fa-spin 2s infinite linear;
+}
+
+.#{$fa-css-prefix}-pulse {
+  animation: fa-spin 1s infinite steps(8);
+}
+
+@keyframes fa-spin {
+  0% {
+    transform: rotate(0deg);
+  }
+
+  100% {
+    transform: rotate(360deg);
+  }
+}

content/styles/fa/_bordered-pulled.scss

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+// Bordered & Pulled
+// -------------------------
+
+.#{$fa-css-prefix}-border {
+  border: solid .08em $fa-border-color;
+  border-radius: .1em;
+  padding: .2em .25em .15em;
+}
+
+.#{$fa-css-prefix}-pull-left { float: left; }
+.#{$fa-css-prefix}-pull-right { float: right; }
+
+.#{$fa-css-prefix},
+.fas,
+.far,
+.fal,
+.fab {
+  &.#{$fa-css-prefix}-pull-left { margin-right: .3em; }
+  &.#{$fa-css-prefix}-pull-right { margin-left: .3em; }
+}

content/styles/fa/_core.scss

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+// Base Class Definition
+// -------------------------
+
+.#{$fa-css-prefix},
+.fas,
+.far,
+.fal,
+.fab {
+  -moz-osx-font-smoothing: grayscale;
+  -webkit-font-smoothing: antialiased;
+  display: inline-block;
+  font-style: normal;
+  font-variant: normal;
+  text-rendering: auto;
+  line-height: 1;
+}
+
+%fa-icon {
+  @include fa-icon;
+}

content/styles/fa/_fixed-width.scss

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+// Fixed Width Icons
+// -------------------------
+.#{$fa-css-prefix}-fw {
+  text-align: center;
+  width: $fa-fw-width;
+}

content/styles/fa/_larger.scss

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+// Icon Sizes
+// -------------------------
+
+// makes the font 33% larger relative to the icon container
+.#{$fa-css-prefix}-lg {
+  font-size: (4em / 3);
+  line-height: (3em / 4);
+  vertical-align: -.0667em;
+}
+
+.#{$fa-css-prefix}-xs {
+  font-size: .75em;
+}
+
+.#{$fa-css-prefix}-sm {
+  font-size: .875em;
+}
+
+@for $i from 1 through 10 {
+  .#{$fa-css-prefix}-#{$i}x {
+    font-size: $i * 1em;
+  }
+}

content/styles/fa/_list.scss

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+// List Icons
+// -------------------------
+
+.#{$fa-css-prefix}-ul {
+  list-style-type: none;
+  margin-left: $fa-li-width * 5/4;
+  padding-left: 0;
+
+  > li { position: relative; }
+}
+
+.#{$fa-css-prefix}-li {
+  left: -$fa-li-width;
+  position: absolute;
+  text-align: center;
+  width: $fa-li-width;
+  line-height: inherit;
+}

content/styles/fa/_mixins.scss

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+// Mixins
+// --------------------------
+
+@mixin fa-icon {
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+  display: inline-block;
+  font-style: normal;
+  font-variant: normal;
+  font-weight: normal;
+  line-height: 1;
+  vertical-align: -.125em;
+}
+
+@mixin fa-icon-rotate($degrees, $rotation) {
+  -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation})";
+  transform: rotate($degrees);
+}
+
+@mixin fa-icon-flip($horiz, $vert, $rotation) {
+  -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=#{$rotation}, mirror=1)";
+  transform: scale($horiz, $vert);
+}
+
+
+// Only display content to screen readers. A la Bootstrap 4.
+//
+// See: http://a11yproject.com/posts/how-to-hide-content/
+
+@mixin sr-only {
+  border: 0;
+  clip: rect(0, 0, 0, 0);
+  height: 1px;
+  margin: -1px;
+  overflow: hidden;
+  padding: 0;
+  position: absolute;
+  width: 1px;
+}
+
+// Use in conjunction with .sr-only to only display content when it's focused.
+//
+// Useful for "Skip to main content" links; see http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
+//
+// Credit: HTML5 Boilerplate
+
+@mixin sr-only-focusable {
+  &:active,
+  &:focus {
+    clip: auto;
+    height: auto;
+    margin: 0;
+    overflow: visible;
+    position: static;
+    width: auto;
+  }
+}

content/styles/fa/_rotated-flipped.scss

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+// Rotated & Flipped Icons
+// -------------------------
+
+.#{$fa-css-prefix}-rotate-90  { @include fa-icon-rotate(90deg, 1);  }
+.#{$fa-css-prefix}-rotate-180 { @include fa-icon-rotate(180deg, 2); }
+.#{$fa-css-prefix}-rotate-270 { @include fa-icon-rotate(270deg, 3); }
+
+.#{$fa-css-prefix}-flip-horizontal { @include fa-icon-flip(-1, 1, 0); }
+.#{$fa-css-prefix}-flip-vertical   { @include fa-icon-flip(1, -1, 2); }
+.#{$fa-css-prefix}-flip-both, .#{$fa-css-prefix}-flip-horizontal.#{$fa-css-prefix}-flip-vertical { @include fa-icon-flip(-1, -1, 2); }
+
+// Hook for IE8-9
+// -------------------------
+
+:root {
+  .#{$fa-css-prefix}-rotate-90,
+  .#{$fa-css-prefix}-rotate-180,
+  .#{$fa-css-prefix}-rotate-270,
+  .#{$fa-css-prefix}-flip-horizontal,
+  .#{$fa-css-prefix}-flip-vertical,
+  .#{$fa-css-prefix}-flip-both {
+    filter: none;
+  }
+}

content/styles/fa/_screen-reader.scss

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+// Screen Readers
+// -------------------------
+
+.sr-only { @include sr-only; }
+.sr-only-focusable { @include sr-only-focusable; }

content/styles/fa/_stacked.scss

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+// Stacked Icons
+// -------------------------
+
+.#{$fa-css-prefix}-stack {
+  display: inline-block;
+  height: 2em;
+  line-height: 2em;
+  position: relative;
+  vertical-align: middle;
+  width: ($fa-fw-width*2);
+}
+
+.#{$fa-css-prefix}-stack-1x,
+.#{$fa-css-prefix}-stack-2x {
+  left: 0;
+  position: absolute;
+  text-align: center;
+  width: 100%;
+}
+
+.#{$fa-css-prefix}-stack-1x {
+  line-height: inherit;
+}
+
+.#{$fa-css-prefix}-stack-2x {
+  font-size: 2em;
+}
+
+.#{$fa-css-prefix}-inverse {
+  color: $fa-inverse;
+}

content/styles/fa/brands.scss

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+@import 'variables';
+
+@font-face {
+  font-family: 'Font Awesome 5 Brands';
+  font-style: normal;
+  font-weight: normal;
+  font-display: $fa-font-display;
+  src: url('#{$fa-font-path}/fa-brands-400.eot');
+  src: url('#{$fa-font-path}/fa-brands-400.eot?#iefix') format('embedded-opentype'),
+  url('#{$fa-font-path}/fa-brands-400.woff2') format('woff2'),
+  url('#{$fa-font-path}/fa-brands-400.woff') format('woff'),
+  url('#{$fa-font-path}/fa-brands-400.ttf') format('truetype'),
+  url('#{$fa-font-path}/fa-brands-400.svg#fontawesome') format('svg');
+}
+
+.fab {
+  font-family: 'Font Awesome 5 Brands';
+}

content/styles/fa/fontawesome.scss

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+@import 'variables';
+@import 'mixins';
+@import 'core';
+@import 'larger';
+@import 'fixed-width';
+@import 'list';
+@import 'bordered-pulled';
+@import 'animated';
+@import 'rotated-flipped';
+@import 'stacked';
+@import 'icons';
+@import 'screen-reader';

content/styles/fa/regular.scss

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+@import 'variables';
+
+@font-face {
+  font-family: 'Font Awesome 5 Free';
+  font-style: normal;
+  font-weight: 400;
+  font-display: $fa-font-display;
+  src: url('#{$fa-font-path}/fa-regular-400.eot');
+  src: url('#{$fa-font-path}/fa-regular-400.eot?#iefix') format('embedded-opentype'),
+  url('#{$fa-font-path}/fa-regular-400.woff2') format('woff2'),
+  url('#{$fa-font-path}/fa-regular-400.woff') format('woff'),
+  url('#{$fa-font-path}/fa-regular-400.ttf') format('truetype'),
+  url('#{$fa-font-path}/fa-regular-400.svg#fontawesome') format('svg');
+}
+
+.far {
+  font-family: 'Font Awesome 5 Free';
+  font-weight: 400;
+}

content/styles/fa/solid.scss

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+@import 'variables';
+
+@font-face {
+  font-family: 'Font Awesome 5 Free';
+  font-style: normal;
+  font-weight: 900;
+  font-display: $fa-font-display;
+  src: url('#{$fa-font-path}/fa-solid-900.eot');
+  src: url('#{$fa-font-path}/fa-solid-900.eot?#iefix') format('embedded-opentype'),
+  url('#{$fa-font-path}/fa-solid-900.woff2') format('woff2'),
+  url('#{$fa-font-path}/fa-solid-900.woff') format('woff'),
+  url('#{$fa-font-path}/fa-solid-900.ttf') format('truetype'),
+  url('#{$fa-font-path}/fa-solid-900.svg#fontawesome') format('svg');
+}
+
+.fa,
+.fas {
+  font-family: 'Font Awesome 5 Free';
+  font-weight: 900;
+}

content/styles/fa/v4-shims.scss

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+@import 'variables';
+@import 'shims';