Exclude docs form having comments

We will have comments in every doc page by default once we enable this in the docs site, but we need to exclude some of them. In order to do so, we need to add the following yaml frontmatter:

comments: false

Docs that do not need a comments area:

• Index pages
• Docs under /update
• Docs under /university
• etc

This should be applied to all projects:

• CE
• EE
• Omnibus
• Runner