Fix Job Badge Consistency Across Site

[jhancock532]

This MR updates the job badge colours and interactions to follow the careers site. The badges are clickable links, but I've removed them from the tab order as keyboard users already have the option to view the jobs page and don't need this twice.

I've removed the thematic colouring of the links for greater consistency across the site menus - this was recommended by Ben Enright.

I'm not sure about my implementation of the badge description text - this content isn't navigable through tab indexes, but I expect it will still be read aloud?

Screenshots