group procs of the same name in TOC (#15487)

* group procs of the same name in TOC

* correctly show `sink` parameters in TOC

* no need to reinvent the wheel - `mgetorPut` exists

* better setting of text color [ci skip]

* fix CSS for better alignment

nimdoc/test_out_index_dot_html/expected/index.html

@@ -94,8 +94,11 @@ function main() {
 <li>
   <a class="reference reference-toplevel" href="#12" id="62">Procs</a>
   <ul class="simple simple-toc-section">
+      <ul class="simple nested-toc-section">foo
       <li><a class="reference" href="#foo"
-    title="foo()"><wbr />foo<span class="attachedType"></span></a></li>
+    title="foo()">foo<span class="attachedType"></span></a></li>
+
+  </ul>
 
   </ul>
 </li>