rewrite features
added how it works to homepage (with placeholder images)
added 'how it works' section to homepage'
finished homepage styles
Moved homepage code to _popit-styles.css
replace images with better screenshots
added, styled and wired up 'read more links'
correct file paths
styled tables
Add documentation-home layout with hosted/self-hosted links

This will be the page for signposting people to correct set of
documentation depending on whether they want to host it themselves or
self-host.
Add brief explaination of difference between hosted/self-hosted

This will probably need to be expanded in the future, but for now it is
sufficient.
Basic structure for new documentation

This is just the barebones structure, the content isn't complete and
there may be more pages to add or possibly some that can be taken away.
add a quickstart guide for developers
change 'get started' link to new instance page
added final call to action to bottom of the footer
Added footer contact link
Update install documentation
Switch to kramdown to get section anchors
Swap prerequisites and get the code sections

The user probably needs to install git before they can get the code, so
swap these two sections over. Also some other minor formatting.