Doc: Updated Font Awesome and added link to Mastodon feed

Assets/WebsiteAssets/templates/partials/footer.mustache

@@ -2,11 +2,12 @@
 	<div class="container">
 		<div class="row">
 			<div class="col-12 col-md-12 social-links">
-				<a href="https://twitter.com/joplinapp" title="Twitter feed"><i class="fab fa-twitter"></i></a>
-				<a href="https://github.com/laurent22/joplin/" title="GitHub repository"><i class="fab fa-github"></i></a>
-				<a href="https://www.patreon.com/joplin" title="Patreon blog"><i class="fab fa-patreon"></i></a>
-				<a href="https://discordapp.com/invite/d2HMPwE" title="Discord chat"><i class="fab fa-discord"></i></a>
-				<a href="https://www.reddit.com/r/joplinapp/" title="Subreddit"><i class="fab fa-reddit"></i></a>
+				<a href="https://twitter.com/joplinapp" title="Joplin Twitter feed"><i class="fab fa-twitter"></i></a>
+				<a href="https://mastodon.social/@joplinapp" title="Joplin Mastodon feed"><i class="fab fa-mastodon"></i></a>
+				<a href="https://www.patreon.com/joplin" title="Joplin Patreon"><i class="fab fa-patreon"></i></a>
+				<a href="https://discordapp.com/invite/d2HMPwE" title="Joplin Discord chat"><i class="fab fa-discord"></i></a>
+				<a href="https://www.reddit.com/r/joplinapp/" title="Joplin Subreddit"><i class="fab fa-reddit"></i></a>
+				<a href="https://github.com/laurent22/joplin/" title="Joplin GitHub repository"><i class="fab fa-github"></i></a>
 			</div>
 		</div>
 

README.md

@@ -476,11 +476,11 @@ Please see the [donation page](https://github.com/laurent22/joplin/blob/dev/read
 Name | Description
 --- | ---
 [Support Forum](https://discourse.joplinapp.org/) | This is the main place for general discussion about Joplin, user support, software development questions, and to discuss new features. Also where the latest beta versions are released and discussed.
-[Sub-reddit](https://www.reddit.com/r/joplinapp/) | Also a good place to get help
-[Discord server](https://discordapp.com/invite/d2HMPwE) | Our chat server
-[Patreon page](https://www.patreon.com/joplin) |The latest news are often posted there
-[Mastodon feed](https://mastodon.social/@joplinapp) | Follow us on Mastodon
 [Twitter feed](https://twitter.com/joplinapp) | Follow us on Twitter
+[Mastodon feed](https://mastodon.social/@joplinapp) | Follow us on Mastodon
+[Patreon page](https://www.patreon.com/joplin) |The latest news are often posted there
+[Discord server](https://discordapp.com/invite/d2HMPwE) | Our chat server
+[Sub-reddit](https://www.reddit.com/r/joplinapp/) | Also a good place to get help
 
 # Contributing