Adding gitignore
docs.edx.org: removes all Bootstrap dependencies
docs.edx.org: adds in revised landing page (WIP) and all new visual/FED dependencies
docs.edx.org: removes unused basic FED assets and design artifacts
docs.edx.org: corrects neat-based grid min value and list-styling mixin
docs.edx.org: syncs Sass mixin naming conventions
docs.edx.org: removes unused decorative elements and styling from masthead
copy added
docs.edx.org: revises page layout based on provided real copy
docs.edx.org: adds in a mage-important period to the sidebar copy
Merge pull request #948 from edx/talbs/edx-docs

docs.edx.org - Visual Styling/FED Revamp