Docs: Fix sections for Antora: "Developer Resources" and "Getting Data from Evergreen"
This commit does the known tasks to prepare each main docs section
for Antora:
- Add chapter labels to nav file items
- To match existing docs "chapter" level headings, combine adoc files as
needed so that each "chapter" from the old docs structure has a single
file linked from the nav
- Upgrade all heading levels in each adoc file so that the top-most
heading is a "Level 1" heading (example: "= Chapter Name =")
- Add ":toc:" below top heading of each file
NOTE: Previous commit had a duplicate title, but should have said "for
section 'Using the Public Access Catalog'".