Merge pull request 'Added rss feed icon to footer' (#29) from rss-icon into master

One issue that I have caused, is there is a lot of inline styling going on with the footer icons. I'll need to clean that up later on but it isn't the end of the world for now. The next time we touch it though, might be worth just adding some css to handle the issues.

src/_includes/footer.html

@@ -10,6 +10,12 @@
         <a href= "https://git.autonomic.zone/autonomic-cooperative/autonomic.zone/src/branch/master/src/assets/pgp"> Verify fingerprint:</a><code id="fingerprint">82FC 87C5 1A71 902F DC10 2CF5 4F90 D55B B24B 1147</code>
 
       <ul class="icons" style="margin-bottom: 0; padding-top: 1em">
+        <li>
+          <a title="RSS Feed" rel="me" href="{{ '/feed.xml' | absolute_url }}" style="border-bottom: none">
+            <!-- This SVG needs to be changed if you change the colour scheme as it is a massive hack. -->
+            <img alt="rss" style="height: 2rem;color: #fff" src="{{ '/assets/svg/rss-square-solid.svg' | absolute_url }}">
+          </a>
+        </li>
         <li>
           <a title="Twitter" rel="noopener" href="{{ site.twitter_url }}" style="border-bottom: none">
             <img alt="twitter" style="height: 2rem;" src="{{ '/assets/svg/twitter-brands.svg' | absolute_url }}">

src/assets/svg/rss-square-solid.svg

@@ -0,0 +1 @@
+<svg aria-hidden="true" focusable="false" data-prefix="fas" data-icon="rss-square" class="svg-inline--fa fa-rss-square fa-w-14" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512"><path fill="#ffffff" d="M400 32H48C21.49 32 0 53.49 0 80v352c0 26.51 21.49 48 48 48h352c26.51 0 48-21.49 48-48V80c0-26.51-21.49-48-48-48zM112 416c-26.51 0-48-21.49-48-48s21.49-48 48-48 48 21.49 48 48-21.49 48-48 48zm157.533 0h-34.335c-6.011 0-11.051-4.636-11.442-10.634-5.214-80.05-69.243-143.92-149.123-149.123-5.997-.39-10.633-5.431-10.633-11.441v-34.335c0-6.535 5.468-11.777 11.994-11.425 110.546 5.974 198.997 94.536 204.964 204.964.352 6.526-4.89 11.994-11.425 11.994zm103.027 0h-34.334c-6.161 0-11.175-4.882-11.427-11.038-5.598-136.535-115.204-246.161-251.76-251.76C68.882 152.949 64 147.935 64 141.774V107.44c0-6.454 5.338-11.664 11.787-11.432 167.83 6.025 302.21 141.191 308.205 308.205.232 6.449-4.978 11.787-11.432 11.787z"></path></svg>