Give includes a more meaningful extension.
Fix page to account for layout changes.
Simplify footer impl.
Fix GitHub-101 page.
Correct indentation, code blocks, use named references, etc.
Update contributors' guide to mention named references.
Extract register block into its own include.
Merge pull request #49 from tobie/fix-gh-101

Fix GitHub-101 page.
add images and updated config
Merge pull request #50 from lmclister/twitterimagefixes

Fix Twitter images - add images and updated config
remaining image updates for testtwf site
Merge pull request #51 from lmclister/testtwf-website/issues/47

remaining image updates for testtwf site. Closes #47.