docs: Add DataFusion subprojects to navigation menu, other minor updates

[andygrove]

Which issue does this PR close?

N/A

Rationale for this change

Add links to DataFusion subproject to make them more easily discoverable

What changes are included in this PR?

• Added links to menu
• Moved bdt from the list of active projects to the list of less active projects
• Reordered list of projects so that they are in alphabet order

Are these changes tested?

Tested locally

Are there any user-facing changes?

No