Add a "Share on Bluesky" button (#5179)

_includes/social-share.html

@@ -12,4 +12,8 @@
   <a href="https://www.linkedin.com/shareArticle?mini=true&url={{ page.url | absolute_url }}" class="btn btn--linkedin" aria-label="Share on LinkedIn" onclick="window.open(this.href, 'window', 'left=20,top=20,width=500,height=500,toolbar=1,resizable=0'); return false;" title="{{ site.data.ui-text[site.locale].share_on_label | default: 'Share on' }} LinkedIn">
     <i class="fab fa-fw fa-linkedin" aria-hidden="true"></i><span> LinkedIn</span>
   </a>
+
+  <a href="https://bsky.app/intent/compose?text={{ page.title | url_encode }}%20{{ page.url | absolute_url | url_encode }}" class="btn btn--bluesky" onclick="window.open(this.href, 'window', 'left=20,top=20,width=500,height=500,toolbar=1,resizable=0'); return false;" title="{{ site.data.ui-text[site.locale].share_on_label | default: 'Share on' }} Bluesky">
+    <i class="fab fa-fw fa-bluesky" aria-hidden="true"></i><span> Bluesky</span>
+  </a>
 </section>

_sass/minimal-mistakes/_buttons.scss

@@ -40,7 +40,8 @@
   (facebook, $facebook-color),
   (twitter, $twitter-color),
   (linkedin, $linkedin-color),
-  (mastodon, $mastodon-color);
+  (mastodon, $mastodon-color),
+  (bluesky, $bluesky-color);
 
   @each $buttoncolor, $color in $buttoncolors {
     &--#{$buttoncolor} {

_sass/minimal-mistakes/_variables.scss

@@ -90,6 +90,7 @@ $yiq-debug: false !default;
 /* brands */
 $behance-color: #1769ff !default;
 $bitbucket-color: #205081 !default;
+$bluesky-color: #1083fe !default;
 $dribbble-color: #ea4c89 !default;
 $facebook-color: #3b5998 !default;
 $flickr-color: #ff0084 !default;