docs: Add top-level support page to the website (#244)

docs/_includes/navigation.html

@@ -1,6 +1,7 @@
 <ul class="navigation">
     <li><a href="/">Symbolic</a></li>
     <li><a href="/releases">Releases</a></li>
+    <li><a href="/support">Support</a></li>
     <li><a href="/privacy-policy">Privacy Policy</a></li>
     <li><a href="https://github.com/inseven/symbolic" target="_blank">GitHub</a></li>
 </ul>

docs/support/index.md

@@ -0,0 +1,12 @@
+---
+title: default.html
+---
+
+# Support
+
+Symbolic is developed in the open on [GitHub](https://github.com/inseven/symbolic). I'd love your feedback so please feel free to join the discussion on [known issues](https://github.com/inseven/symbolic/issues), raise a [new issue](https://github.com/inseven/symbolic/issues/new), drop me an [email](mailto:[email protected]?subject=Symbolic%20Support), or reach out on [Mastodon](https://mastodon.me.uk/web/@jbmorley).
+
+- [Known Issues](https://github.com/inseven/symbolic/issues)
+- [New Issue](https://github.com/inseven/symbolic/issues/new)
+- [Email](mailto:[email protected]?subject=Symbolic%20Support)
+- [Mastodon](https://mastodon.me.uk/web/@jbmorley)