Collect email addresses from github

[wlach]

This will let us reach out more easily to people who log into
alpha.iodide.io. Standard Mozilla privacy policy still applies
and GitHub will ensure that people consent to this.

Pull Request checklist

• [N/A] Documentation: If this feature has or requires documentation, the relevant docs have been updated.
• Changelog: This PR updates the changelog with any user-visible changes.
• [N/A] Tests: This PR includes thorough tests or an explanation of why it does not

[bcolloran]

thanks Will 👍

[wlach]

Image of github permissions dialog:

[codecov]

Codecov Report

Merging #2329 into master will decrease coverage by 9.92%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2329      +/-   ##
==========================================
- Coverage   69.35%   59.42%   -9.93%     
==========================================
  Files         220      168      -52     
  Lines        5335     3707    -1628     
  Branches      854      736     -118     
==========================================
- Hits         3700     2203    -1497     
+ Misses       1606     1504     -102     
+ Partials       29        0      -29

Impacted Files	Coverage Δ
server/openidc/tests/test_middleware.py
server/notebooks/urls.py
server/tests/test_settings.py
server/tests/test_token_authentication.py
server/notebooks/apps.py
server/notebooks/views.py
server/notebooks/api_views.py
server/notebooks/api_urls.py
server/celery.py
server/notebooks/middleware.py
... and 41 more

---

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[wlach]

test-server is failing due to an issue unrelated to this PR: #2330