First iteration of settings page

[alysivji]

Start of #258

What does this do

• add Flask-WTForms to the project
• add forms for timezone (info is saved in database, but we do nothing with it)

Why are we doing this

Need a better way for admins to modify settings.

How should this be tested

no tests right now, this functionality is not connected to the rest of the app

Migrations

adding nullable columns to GitHub Summary Configuration table.

Dependencies

n/a

Callouts

n/a

[codecov-commenter]

Codecov Report

Merging #280 into master will decrease coverage by 1.22%.
The diff coverage is 68.67%.

@@            Coverage Diff             @@
##           master     #280      +/-   ##
==========================================
- Coverage   97.11%   95.89%   -1.23%     
==========================================
  Files          68       71       +3     
  Lines        1874     1950      +76     
==========================================
+ Hits         1820     1870      +50     
- Misses         54       80      +26     

Impacted Files	Coverage Δ
busy_beaver/apps/web/views.py	60.00% <44.44%> (-40.00%)	⬇️
busy_beaver/apps/web/workflows.py	60.00% <60.00%> (ø)
busy_beaver/common/wrappers/slack.py	95.08% <66.66%> (-3.10%)	⬇️
busy_beaver/apps/github_integration/models.py	100.00% <100.00%> (ø)
busy_beaver/apps/web/forms.py	100.00% <100.00%> (ø)
busy_beaver/common/datetime_utilities.py	100.00% <100.00%> (ø)

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