docs: Add Symmetry Magazine article on likelihood publication

[matthewfeickert]

Description

Resolves #1262

Adds "ATLAS releases ‘full orchestra’ of analysis instruments" Symmetry Magazine article to "In the Media" section in the docs.

ReadTheDocs build: https://pyhf.readthedocs.io/en/docs-add-symmetry-magazine-article/outreach.html#in-the-media

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* Add Symmetry Magazine article on likelihood publication using pyhf to docs
   - c.f. https://www.symmetrymagazine.org/article/atlas-releases-full-orchestra-of-analysis-instruments

[codecov]

Codecov Report

Merging #1263 (76dd536) into master (e64e87b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1263   +/-   ##
=======================================
  Coverage   97.47%   97.47%           
=======================================
  Files          63       63           
  Lines        3716     3716           
  Branches      525      525           
=======================================
  Hits         3622     3622           
  Misses         55       55           
  Partials       39       39           

Flag	Coverage Δ
unittests	97.47% <ø> (ø)

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