Made the site web ready.

Added cache control headers and gzip encoding.
Added support for sub-directory install.
Fixed outdated templates.
Added compiled css and js files.
Changed the issue flow. Open, close, flip are now manual.
Removed the vendor code and the assets.
Updated the 3d transitions.
The issue page now has a full screen layout.
Set up the homepage content and the invites mailing.
Added new admin section to create users.
Set up invite hash login and nda splash.
Minor bug fixes.

Fixed js error instantiating dropzone twice on the edit issue page.
Stopped having relative urls on the invite email template.
Stopped nda click handler from firing on all pages.