Fixed/Refactored logic for the support footers make a contribution link:

[MitchellShiell]

Linked to issue: https://github.com/overture-stack/website/issues/389

I provided detailed comments in the updated code that should provide any missing context in the summary below

Summary:

Problem:

• The previous default github URL referenced the develop branch, which no longer exists
• I also noticed several edge cases where the logic failed to account that the path in the github repo led to a file named index.md (and therefore not represented the URL)

Solution:

• Tested and covered all edge cases where the documentation directory pointed to an index.md
• Made code more readable using switchcasing (Jon showed me this as a good alternative to elseif awhile back)
• Removed redundant url.includes
• Updated Song documentation folder from configurations to configuration, this is uniform naming across products, so one less edge case

[justincorrigible]

le Squash and merge, le friend 🙏