Lots of template reformatting/untabifying. No visual changes.

Clean up badges.mak template.

- Nuke tabs
- Simplify some logic/move some stuff out to a function.

fix 404.mak indentation

fix 500.mak indentation

remove tabs from 404 and 500

remove tabs from about.mak

reformat admin.mak

reformat/untabify assertion_widget.mak

reformat/untabify builder.mak

reformat/untabify explore.mak

reformat/untabify explore_badges.mak

reformat/untabify index.mak

reformat/untabify leaderboard.mak

reformat/untabify login.mak

reformat/untabify master.mak

reformat/untabify tags.mak

reformat/untabify user.mak

reformat/untabify functions.mak