[site] Removed hopeless donate panel
[site] Update website for 2.4 release

Signed-off-by: Neil Bartlett <njbartlett@gmail.com>
[site] Add vagrant info for site building

Signed-off-by: Neil Bartlett <njbartlett@gmail.com>
[site] Fixed typo in installation page

Signed-off-by: Neil Bartlett <njbartlett@gmail.com>
[site] Added .vagrant to gitignore

Signed-off-by: Neil Bartlett <njbartlett@gmail.com>