Added banner for incident status

[juneguo257]

Reference for more information:
https://github.com/pennlabs/status/pull/4
pennlabs/office-hours-queue#339

This is part of an ongoing effort to add status banners during incidents to every labs page when we're experiencing an outage.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.31%. Comparing base (20140cb) to head (5eb4d0c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #872   +/-   ##
=======================================
  Coverage   76.31%   76.31%           
=======================================
  Files          35       35           
  Lines        8270     8270           
=======================================
  Hits         6311     6311           
  Misses       1959     1959           

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