Merge branch 'revert-0658ebf7' into 'master'

Revert "Merge branch 'fix-mermaid-chart-docs' into 'master'"

See merge request gitlab-org/gitlab-ce!28193

doc/development/architecture.md

-<script src="https://unpkg.com/mermaid@8.0.0/dist/mermaid.min.js"></script>
-<script>mermaid.initialize({startOnLoad:true});</script>
-
 # GitLab Architecture Overview
 
 ## Software delivery
@@ -213,7 +210,7 @@ To serve repositories over SSH there's an add-on application called gitlab-shell
 
 ### Components
 
-<div class="mermaid">
+```mermaid
 graph TB
 
   HTTP[HTTP/HTTPS] -- TCP 80, 443 --> NGINX(NGINX)
@@ -313,7 +310,7 @@ class Alertmanager defaultoff
 class SMTP defaultoff
 class ObjectStorage defaultoff
 class Geo defaultoff
-</div>
+```
 
 **Legend**: