Set cache expiration date to 2 days
Feature Motivation
Some changes we make to Cauldron's static files (JS / CSS) are not applied correctly in some clients because these files have very high cache expiration dates or they do not have any. We should set this cache expiration date somehow, either through Django or Nginx, so that in future times the modified static files will reload correctly.
Closing conditions
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Have a cache expiration date of 2 days for every file served by Cauldron.