added new ideas to ideas/index.rst

See merge request !24

Typo corrected in site-editing.html

See merge request gsoc/gsoc.beagleboard.io!23

Fix typos in guides files

See merge request !21

Site cleanup, add mission statement, and add bash & boris comic strip

See merge request !20

Update ideas page layout and sidebar

See merge request !19

This reverts commit a3a4274d.

remove extra dropdown

See merge request !16