Update docs with Javascript accord.

What does this MR do?

Updates the docs with a Javascript Accord.

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

Why was this MR needed?

To bring harmony to the frontend.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Documentation created/updated
• Review
  • Has been reviewed by Frontend
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

None

cc @gl-frontend