Footer: add links to source code, issues, roadmap

tildes/scss/modules/_site-footer.scss

@@ -15,6 +15,7 @@
 
 .site-footer-links {
   display: flex;
+  flex-wrap: wrap;
   justify-content: center;
 
   list-style-type: none;
@@ -24,7 +25,10 @@
 }
 
 .site-footer-link {
+  @include min-touch-size;
+
   margin: 0;
+  white-space: nowrap;
 
   & + & {
     margin-left: 1rem;

tildes/tildes/templates/base.jinja2

@@ -80,6 +80,8 @@
     <li class="site-footer-link"><a href="https://docs.tildes.net">Docs</a></li>
     <li class="site-footer-link"><a href="https://blog.tildes.net">Blog</a></li>
     <li class="site-footer-link"><a href="https://docs.tildes.net/contact">Contact</a></li>
+    <li class="site-footer-link"><a href="https://gitlab.com/tildes/tildes">Source code</a></li>
+    <li class="site-footer-link"><a href="https://gitlab.com/tildes/tildes/issues">Issues</a> / <a href="https://gitlab.com/tildes/tildes/boards">Roadmap</a></li>
     <li class="site-footer-link"><a href="https://docs.tildes.net/privacy-policy">Privacy policy</a></li>
     <li class="site-footer-link"><a href="https://docs.tildes.net/terms-of-use">Terms of use</a></li>
   </ul>