Converting drupal.org/documentation to the Section content type

Designing a better top-level landing page for Drupal.org/documentation is a key priority this year. To start, we'll be converting the existing landing page with its current content to the full section content type, and granting Documentation Working Group members more control over the function and layout of this landing page. There are additional features and requirements being discussed in the issue that may be completed as follow ups.

Production outage: No
Change affects: Drupal.org/documentation
Deployment schedule: still in development
Backout plan: revert or fix in place