Change colour of progress bars when at 100% completion of a module or dojo

[MartinPetkov]

Just a small request for visual clarification, but it would be nice if the progress bars under dojos switched colours when 100% complete i.e. from the current teal to maybe the hacker green that's seen in the rest of the theme.

I was mildly affected by this when I thought I had finished Linux Luminarium but didn't get the badge, and realized I had missed 1 exercise in 1 module, which would've been easier to spot if the colours changed upon completion.

[mateuseap]

Hi @adamdoupe! I noticed you're already assigned to this issue, but I was wondering if there’s anything I could do to assist or contribute. I’d be happy to help and open a PR if that’s okay with you!