Update the footer and the home page to include Bluesky and Mastodon a…

_includes/footer.html

@@ -31,7 +31,9 @@
       </label>
     </form>
     <aside>
-      <a href="https://twitter.com/swiftlang" rel="nofollow" title="Follow @SwiftLang on Twitter"><i class="twitter"></i></a>
+      <a href="https://x.com/swiftlang" rel="me" title="Follow @SwiftLang on X"><i class="x"></i></a>
+      <a href="https://bsky.app/profile/swift.org" rel="me" title="Follow @swift.org on Bluesky"><i class="bluesky"></i></a>
+      <a href="https://mastodon.social/@swiftlang" rel="me" title="Follow @swiftLang on Mastodon"><i class="mastodon"></i></a>
       <a href="/atom.xml" title="Subscribe to Site Updates"><i class="feed"></i></a>
     </aside>
   </div>

assets/stylesheets/_screen.scss

@@ -515,8 +515,14 @@ footer[role="contentinfo"] {
       margin-left: 1em;
       float: right;
 
-      &.twitter {
-        background-image: url("/assets/images/icon-twitter.svg");
+      &.x {
+        background-image: url("/assets/images/icon-x.svg");
+      }
+      &.mastodon {
+        background-image: url("/assets/images/icon-mastodon.svg");
+      }
+      &.bluesky {
+        background-image: url("/assets/images/icon-bluesky.svg");
       }
 
       &.feed {

index.md

@@ -130,7 +130,9 @@ Stay up-to-date with the latest in the Swift community.
 <div class="links links-list-nostyle" markdown="1">
   - [Visit the Swift.org blog](/blog/)
   - [Visit the Swift forums](https://forums.swift.org)
-  - [Follow @swiftlang on X (formerly Twitter)](https://twitter.com/swiftlang){:target="_blank" class="link-external"}
+  - [Follow @swiftlang on X (formerly Twitter)](https://x.com/swiftlang){:target="_blank" class="link-external"}
+  - [Follow @swift.org on Bluesky](https://bsky.app/profile/swift.org){:target="_blank" class="link-external"}
+  - [Follow @swiftlang on Mastodon](https://mastodon.social/@swiftlang){:target="_blank" class="link-external"}
 </div>
 
 <script>