Move the github ribbon into the sidebar

Which makes it scroll with the sidebar, rather that with the main page

editions/tw5.com/tiddlers/system/github-fork-ribbon.tid

@@ -1,5 +1,5 @@
 title: $:/editions/tw5.com/github-fork-ribbon
-tags: $:/tags/PageTemplate
+tags: $:/tags/PageControls
 
 <div class="github-fork-ribbon-wrapper right"><div class="github-fork-ribbon"><a href="https://github.com/Jermolene/TiddlyWiki5" target="_blank">Find me on ~GitHub</a></div>
 </div>