Docs: Improve styling of GitHub contributors listing

editions/tw5.com/tiddlers/system/doc-macros.tid

@@ -1,5 +1,5 @@
 created: 20150117152607000
-modified: 20211230150413997
+modified: 20220714133424023
 tags: $:/tags/Macro
 title: $:/editions/tw5.com/doc-macros
 type: text/vnd.tiddlywiki
@@ -171,4 +171,14 @@ $credit$
 </div>
 \end
 
+\define .contributors(usernames)
+<ol class="doc-github-contributors">
+<$list filter="[enlist<__usernames__>sort[]]" variable="username">
+<li>
+<a href={{{ [[https://github.com/]addsuffix<username>] }}} class="tc-tiddlylink-external" target="_blank" rel="noopener noreferrer"><img src={{{ [[https://github.com/]addsuffix<username>addsuffix[.png?size=24]] }}} width="24" height="24"/><span class="doc-github-contributor-username"> @<$text text=<<username>>/></span></a>
+</li>
+</$list>
+</ol>
+\end
+
 <pre><$view field="text"/></pre>