docs(backport): Update docs requirements and use citations

[matthewfeickert]

Description

• Backport:
  • PR docs: Update release checklist #2291
  • PR fix: Use Path object for jupyterlite-sphinx jupyterlite_dir config #2300
  • PR docs: Add use citation from H->aa ATLAS CONF note #2306
  • PR test: Ignore World Scientific journal URLs during Sphinx linkcheck #2308
  • PR chore: Require sphinx-rtd-theme of v1.3.0+ #2309
  • PR docs: Add general use citation from 'Branches of a Tree' paper #2312
  • PR docs: Add use citation from extended SPANet paper #2315
  • PR docs: Add MRs to ATLAS StatAnalysis to release checklist #2316

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Backport:
   - PR https://github.com/scikit-hep/pyhf/pull/2291
   - PR https://github.com/scikit-hep/pyhf/pull/2300
   - PR https://github.com/scikit-hep/pyhf/pull/2306
   - PR https://github.com/scikit-hep/pyhf/pull/2308
   - PR https://github.com/scikit-hep/pyhf/pull/2309
   - PR https://github.com/scikit-hep/pyhf/pull/2312
   - PR https://github.com/scikit-hep/pyhf/pull/2315
   - PR https://github.com/scikit-hep/pyhf/pull/2316

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release/v0.7.x@7c4e9e9). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@                Coverage Diff                @@
##             release/v0.7.x    #2320   +/-   ##
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  Coverage                  ?   96.25%           
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  Files                     ?       69           
  Lines                     ?     4483           
  Branches                  ?      610           
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  Hits                      ?     4315           
  Misses                    ?      129           
  Partials                  ?       39           

Flag	Coverage Δ
unittests-3.7	96.25% <0.00%> (?)

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