docs: update broken hyperlinks to docs

[neiforfaen]

Summary

Fix broken hyperlinks in the README.md

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @neiforfaen to sign the Salesforce Inc. Contributor License Agreement.

[zimeg]

@neiforfaen Super duper appreciate the quick fix! Our redirects might be offline right now... 📚 ✨

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.86%. Comparing base (7ce931d) to head (fc1a521).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #591   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files           7        7           
  Lines         718      718           
=======================================
  Hits          717      717           
  Misses          1        1           

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[zimeg]

⚠️ #552 remains relevant I fear:

Error: Integration tests from forked branches require maintainer approval.