Mod proposals to Kroki post

According to earlier comment:

• try to reduce the hurdle for Gitlab non-natives using easier wording, some basic gitlab intro, link to actual gitlab examples.

To do:

• Easier intro text and links.
• Create Gitlab example project and link to it.
  • make that example public do this in parent branch kroki-post
• clarify post categories/types and show on front page ----> move to extra issue/MR

Review app

_posts/2021/05/2021-05-26-diagrams-from-textual-descriptions.md

@@ -36,7 +36,7 @@ where Markdown is supported:
   * Snippets (the snippet must be named with a `.md` extension)
   * Wiki pages
 
-<a href="."
+<a href="https://gitlab.hzdr.de/examples/kroki"
                             class="btn btn-outline-secondary"
                             title="Link to examples in Gitlab"> 
                             <i class="fas fa-lightbulb"></i> Click here for examples in Gitlab! <i class="fas fa-lightbulb"></i></a>