redirect all pages to GitHubGuides channel
better wording for redirect
added gridism basics via bower
updated with better structure and format.

added gridism
added content
removed in file styles.
added useful styles to the apparent landing page css file
Change hot-linked YouTube banner image for local resource

Replaced URL of GitHub YouTube banner from hot-link of
YouTube image hosting to local resources in the images
folder of this project site.
Revised banner and header

Replaced inline banner image with CSS styled element; Styled H4 to
include underline/divider for clearer separation of page content
and additional links.
Updated applicable URLs to HTTPS
Merge pull request #49 from github/redirect-lessons

Redirect lessons