add meta tags to render links on social media

[teonbrooks]

No description provided.

[teonbrooks]

@wlach, I think these are the meta tags needed to make the links rendered nicely on twitter and facebook. since we don't have small descriptions, I just duped the title for the description. since I haven't taken the time to properly learn django, I'm not certain if that is the correct pattern for inserted the title into the html

[codecov]

Codecov Report

Merging #2344 into master will decrease coverage by 10.18%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #2344       +/-   ##
===========================================
- Coverage   69.61%   59.42%   -10.19%     
===========================================
  Files         222      170       -52     
  Lines        5469     3783     -1686     
  Branches      872      754      -118     
===========================================
- Hits         3807     2248     -1559     
+ Misses       1637     1535      -102     
+ Partials       25        0       -25

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 40 more

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[wlach]

This is close, I think one property should be derived from a setting, in case people are sharing from other instances of iodide. To make them available to every template without having to specify them many times, we can use a context processor. See this stackoverflow question:

https://stackoverflow.com/a/433209

Also, could you add an entry to CHANGELOG.md?

[wlach]

This should be derived from settings.SITE_URL

[wlach]

hey @teonbrooks, will you have time to look into this in the next couple days? I'd like to get this in before the next iodide release

[wlach]

I adjusted the comments for the meta tags, but other than that, this looks great! I will merge.