Unnecessary file - indexbase.html

[aryanpingle]

indexbase.html does effectively the same thing as base.html, but for users who aren't signed in yet. The file should be deleted, and anything dependent on it should be refactored to use base.html.

WHY

Pretty soon we'll have to do some homepage redesigns, and we'll definitely run into errors because we'll forget about this extra file.
It's already affecting development of "homepage pages" like 'contact us' and 'developers', because they sometimes extend into indexbase.html.

Possible solution is to send a user-authenticated flag to base.html so that it displays the right thing for the right visitor.