DOC: Add ref to main title so downstream can use intersphinx

[pllim]

I cannot add milestone or label here, but you can milestone to whatever you want but preferably whatever version you plan to release next (be it major, minor, or bug fix) and backport if needed. No change log is needed.

This is to address https://github.com/spacetelescope/jdaviz/pull/3301/files#r1847057593

Tasks

• request a review from someone specific, to avoid making the maintainers review every PR @bmorris3
• add a build milestone, i.e. 24Q4_B15 (use the latest build if not sure)
• Does this PR change user-facing code / API? (if not, label with no-changelog-entry-needed)
  • write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types)
  • update or add relevant tests
  • update relevant docstrings and / or docs/ page
  • start a regression test and include a link to the running job (click here for instructions)
    • Do truth files need to be updated ("okified")?
      • after the reviewer has approved these changes, run okify_regtests to update the truth files
• if a JIRA ticket exists, make sure it is resolved properly

[pllim]

Also no actual code is touched so you can skip all the CI stuff in your checklist. Just make sure RTD builds. Thanks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.68%. Comparing base (caef567) to head (c30157b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1529   +/-   ##
=======================================
  Coverage   76.68%   76.68%           
=======================================
  Files         120      120           
  Lines        7832     7832           
=======================================
  Hits         6006     6006           
  Misses       1826     1826           

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