Draft: Resolve "test theme creator"

Closes #10 (closed)

Discourse_test/common/after_header/after_header.html

+<!-- code bannière /3 -->
+<div class="hello-world-banner">
+  <h1 class="hello-world">Hello World!</h1>
+</div>
+
+<!-- code liste de catégories -->
\ No newline at end of file