public shortcuts management page

[JoeyRubas]

We have 7 quick links on the homepage, but they're not always the most important, and the total number of links available is quickly growing. Here we let tournament admins manage which links appear on the homepage

[codecov]

Codecov Report

❌ Patch coverage is 95.45455% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.96%. Comparing base (a9578a8) to head (410906d).

Files with missing lines	Patch %	Lines
mittab/apps/tab/admin.py	73.68%	5 Missing ⚠️
mittab/apps/tab/forms.py	92.30%	2 Missing ⚠️
mittab/apps/tab/models.py	96.42%	2 Missing ⚠️
mittab/apps/tab/middleware.py	50.00%	1 Missing ⚠️
mittab/apps/tab/views/auth_views.py	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #499      +/-   ##
==========================================
+ Coverage   76.31%   76.96%   +0.64%     
==========================================
  Files         111      113       +2     
  Lines        8099     8335     +236     
==========================================
+ Hits         6181     6415     +234     
- Misses       1918     1920       +2     

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