Stop logging the TGT session to the console.

There's really no need to do that anymore.
Refactor login prompts.

Stop duplicating large swathes of code.
Refactor CSS slightly.

Get rid of header ~ * * selector. It's making changes very difficult.
Desupport DES and add error message.

Issue #35.
Delete DES code.

Closes #35.
Rebuild dist/webathena.js