Add Source Code link

* I added a link to the source code in the footer
    * It opens in a new page because that's consistent with the rest of the site
* I also added a section for contributors to the README.md with where they can contact us via mail or via matrix

README.md

@@ -10,6 +10,10 @@ This repo only contains static content. Put the files where you want to host the
 
 This depends on how you installed it on the server. If you used `git clone <url>`, you can simply do `git pull` and your done. Otherwise optionally remove the current content and overwrite it with the new content.
 
+# How to contribute
+
+If you have feedback or want to make changes, feel free to contact us at [ahoy@parley.be](mailto:ahoy@parley.be) or on matrix at [#ppbe-internetz:matrix.org](https://app.element.io/#/room/#ppbe-internetz:matrix.org).
+
 # License
 
 The website and theme are both licensed under a [Creative Commons Attribution 3.0 Unported license](https://creativecommons.org/licenses/by/3.0/)

index.html

@@ -163,7 +163,9 @@
 			<footer id="footer" class="wrapper style1-alt">
 				<div class="inner">
 					<ul class="menu">
-						<li><a rel="license" href="http://creativecommons.org/licenses/by/3.0/" target="_blank"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/3.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/3.0/" target="_blank">Creative Commons Attribution 3.0 Unported License</a>.</li><li>Design: <a href="https://html5up.net/hyperspace" target="_blank">Hyperspace</a> on <a href="http://html5up.net" target="_blank">HTML5 UP</a></li>
+						<li><a rel="license" href="http://creativecommons.org/licenses/by/3.0/" target="_blank"><img alt="Creative Commons License" style="border-width:0" src="https://i.creativecommons.org/l/by/3.0/88x31.png" /></a><br />This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by/3.0/" target="_blank">Creative Commons Attribution 3.0 Unported License</a>.</li>
+						<li>Design: <a href="https://html5up.net/hyperspace" target="_blank">Hyperspace</a> on <a href="http://html5up.net" target="_blank">HTML5 UP</a></li>
+						<li><a href="https://dev.parley.be/PPBe/parley_landing_page/" target="_blank">Source Code</a></li>
 					</ul>
 				</div>
 			</footer>