Rebuild entire website nightly

[kavigupta]

The website should automatically rebuild nightly at 0030 or something. This will ensure that assignments get released on time.

I was considering a hack where we'd have a bot constantly creating and merging a trivial change. But @mehrdadn suggested there might be a more intelligent solution.

[kavigupta]

@mehrdadn if you can't think of anything pls reassign to me and i'll implement the hack

[mehrdadn]

@kavigupta I already added the code, I just haven't had a chance to check if it actually works. 6aa8d1d

[kavigupta]

oh ok, close once you've had a chance to test, or i might test at some point

[mehrdadn]

I just realized the time zone for this is probably the server time zone so that might need to be checked/fixed...