Removed bootstrap theme and enlarged footer area.

[mattsmida]

Fixes #776

• Removed the bootstrap theme CSS file, consistent with tw.org
• Expanded the area of the footer to match that of tw.org

[mattsmida]

@lauft am I missing anything obvious by getting rid of the bootstrap theme file? As long as that's alright, this is good to merge.

[lauft]

@lauft am I missing anything obvious by getting rid of the bootstrap theme file?

@mattsmida Sorry for being late for the party. As long as the website looks good and works, it is usually fine 🙂