Merge pull request #11 from kayleanelson/master

modified css to improve mobile compatibility and general styles consistency
Add fancy astronomy background -- because, hey, it's "Astro" py
Include background only on index page
Center and make image seamless
Add copyright for image
Fixed links to docs
Changed a few docs links back to /latest/
Merge pull request #12 from astrofrog/fix-docs-links

Fixed links to docs
sanitized for eteq/gh-pages by removing CNAME and analytics
Merge remote-tracking branch 'mdboom/astro-background' into gh-pages