listers/loaders: Add link to developer documentation

(red means there is no developer doc)

docs/_static/custom.css

+html[data-theme="light"] {
+  --pst-color-primary: #e20026;
+  --pst-color-secondary: #52566D;
+}
+
+html[data-theme="dark"] {
+  --pst-color-primary: #e20026;
+  --pst-color-secondary: #dbdbdb;
+  --pst-color-secondary-text: #141325;
+}
+
+
 table.swh-logos-table td,
 table.swh-logos-table th {
   text-align: center;