Update docs.css

Add that red to blue gradient background for IE9 and lower. (note it doesn't display at 45 degree angle, but better having this than it just displaying as a white background)
Add TOC and fix headings
Minify theme files
Use the minified assets in the examples
fix #273 by documenting project's directory structure
Merge pull request #403 from twbs/doc-directories-273

document project's directory structure
getting rid of unused css in docs.scss
Move Ratchicons to fonts/
Fixes #391
Closes #393
remove unneed grid
adding back some css
getting rid of old classes in the markup
Merge pull request #401 from ZDroid/minify

Improve minification
Merge pull request #404 from twbs/docs-cleanup

Docs cleanup
Merge pull request #384 from ZDroid/toc

Add TOC and fix headings
Run `grunt`.
Merge pull request #348 from coliff/patch-5
Update docs.scss too for PR #348 and run `grunt`.