LP#1848524: fix various sections

LP#1848524: fix various sections

For Serials:

  - Add chapter labels to nav file items
  - (Not needed for this section.) Combine adoc files 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

For Circulation:

  - 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
      - Added advanced_holds.adoc to the end of basic_holds.adoc
  - 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

Signed-off-by: Remington Steed <rjs7@calvin.edu>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>