Adding OME 5 to docs dropdown menu
Update version history page to 4.4.8
Putting new menu under docs rather than products!
Changing downloads links & removing unused extlink
Updating download link in sidebar menu
Fixing downloads link
Merge pull request #538 from hflynn/menus

Update menu for OME 5 to docs pages & update version history
Merge pull request #539 from hflynn/5configs

Changing downloads links & removing unused extlink