Make the architecture table displayed in a block

By default, all tables have a width of 100% on docs.gitlab.com.
In a few cases, the table will overlap the table of contents (ToC).
For these cases, we need to add an entry to the document’s frontmatter
to render them as a display block.

doc/development/architecture.md

@@ -1,3 +1,7 @@
+---
+table_display_block: true
+---
+
 # GitLab Architecture Overview
 
 ## Software delivery