* Focalboard website revamp work
* Removed alternate grey footer
* Update Contribute link and general styles
* Updated homepage images
* Update image src and alt for homepage
* Update nav items and general styles
* Fix menu items for focalboard.com internal pages
* Update README with asset versioning notes. Update URLs in footer. Update asset versions in query strings.
Co-authored-by: Jared <jared@presentlogic.com>
Co-authored-by: Jared Thomas <jared.thomas@ela1.com>
