docs: Add use citations from ICHEP 2022 proceedings

[matthewfeickert]

Description

Add use citation from The IRIS-HEP Analysis Grand Challenge (by @alexander-held and @oshadura) and pyhf: a pure-Python statistical fitting library with tensors and automatic differentiation (by the pyhf dev team) which both appear in the ICHEP 2022 proceedings.

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* Add use citation from 'The IRIS-HEP Analysis Grand Challenge' and
 'pyhf: a pure-Python statistical fitting library with tensors and
  automatic differentiation' which both appear in the ICHEP 2022
  proceedings.
   - https://inspirehep.net/literature/2598292
   - https://inspirehep.net/literature/2598491

[matthewfeickert]

I'm going to approve and merge this myself. As always, PRs approved by a single core dev can be reverted as needed by the rest of the dev team.

[matthewfeickert]

Relevant RTD build: https://pyhf--2066.org.readthedocs.build/en/2066/citations.html

[codecov]

Codecov Report

Base: 98.30% // Head: 98.30% // No change to project coverage 👍

Coverage data is based on head (a7e247f) compared to base (d9355e2).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2066   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
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  Files          69       69           
  Lines        4530     4530           
  Branches      645      645           
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  Hits         4453     4453           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	97.88% <ø> (ø)
doctest	61.14% <ø> (ø)
unittests-3.10	96.31% <ø> (ø)
unittests-3.8	96.33% <ø> (ø)
unittests-3.9	96.35% <ø> (ø)

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[matthewfeickert]

Hm. Something related to spatialaudio/nbsphinx#24 is breaking the docs build. We're getting

WARNING: Pygments lexer name 'ipython3' is not known

for all the notebooks during the docs build and we fail on warnings.