Fix broken links in README

[adayNU]

It seems like because a few links lack a protocol, GitHub is treating them as Relative Links.

Changes

Just cosmetic fixes to the README.

How I tested this

Previewing my changes in the rich diff shows the links are now correct.

Notes

N/A

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[zilto]

Good catch! Thank you for the Pull request