Changed http to https for Github links

This will cut down on excessive 301 redirects for link crawlers
Remove weird escaping cruft
Removed a bunch of textile cruft
Fixed a bunch more broken links
Fix broken images
Footer tweaks
Update net-ssh in attempt to fix deploy issues
Spree logo should point to spreecommerce.com
Get edge deploy working
Symlink robots.txt and favicon
Converted shipments doc to .md and corrected some typos.
Switched payments to .md format; added some markup and corrections
Fixed ubuntu page title
typo fix
Fixed broken links in API header
Fixed footer
[deploy-ubuntu] Correct linebreak for first commands
[deploy-ubuntu] Correct ruby version in ubuntu guide
[deploy-ubuntu] Fix line break in application and repo settings
[deploy-ubuntu] fix 2 more line breaks missing