Change the languages chart from chart.js to d3.js

What does this MR do?

Refactors the languages chart from the Repository -> Charts, from using Chart.js to d3.js

This is part of an effort to consolidate our graphics libraries from Raphael.js, Chart.js, etc. to d3.js as to reduce our assets footprint

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

I.O.U.

TODO's

• Create the relevant issue
• Create a reusable tooltip compatible with d3 - [ ] Perhaps update the backend to avoid the use of inline javascript
• Update and/or create tests