Fixes #16782: First access to mantisbt.org is slow.
Remove contact us control.
Move MantisTouch from home page to addons page.
Remove 'phone' menu option in favor of addons page.
Remove sponsors page.
Remove broken links.
Remove link to MantisTouch and MantisConnect from download page.
Remove hosting link from download page.
No 'we' in hosting.
Remove references to contact us.
Remove commercial support section with link to hosting / consulting from support page.
Add MantisBT screenshot to home page.
Trim logo from mantisbt screenshot - otherwise it is appearing redundant with logo at top of page.
Add an empty line as the footer until we add a proper footer in the new design - otherwise, the content ends up sticking to the bottom fo the browser.
Remove yellow boxes from support page and replace with normal bullets.
Merge latest changes to website.