docs: Add talks and use citations from 2020

[matthewfeickert]

Description

• Resolves add citation  #1253
• Resolves Add SciPy 2020 talk once DOI is available #920

Add use citations

• Search for new phenomena in events with two opposite-charge leptons, jets and missing transverse momentum in p p collisions at √s = 13 TeV with the ATLAS detector (ATLAS-CONF-2020-046)
• New developments in SModelS

and talks

• TOOLS 2020 workshop talk
• SciPy 2020 talk

ReadTheDocs build:

• https://pyhf.readthedocs.io/en/docs-add-end-2020-citations/citations.html
• https://pyhf.readthedocs.io/en/docs-add-end-2020-citations/outreach.html#presentations

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

* Add use citations from 2020
   - ATLAS-CONF-2020-046 (https://inspirehep.net/literature/1811757)
   - New developments in SModelS (https://inspirehep.net/literature/1836682)
* Add talks on pyhf from 2020
   - SciPy 2020 (https://doi.org/10.25080/Majora-342d178e-023)
   - TOOLS 2020 (https://indico.cern.ch/event/955391/contributions/4075505/)
* Add VS Code workspace settings to gitignore

[codecov]

Codecov Report

Merging #1254 (a41c08b) into master (df40fe4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1254   +/-   ##
=======================================
  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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