Broken link in README.md

[SamOgon-one]

There is a broken link in the README.md results in a 404 error:
https://github.com/LSmith-Zenoscave/SpringChallenge2021

[SlaVKsVolks]

Hi - I noticed this is a narrow broken-link cleanup in the README.

I can do a $35 fixed-scope docs PR today if you are open to a paid small fix.

Scope would be limited to:

• identify the broken README link target
• replace it with the current correct target or remove it if obsolete
• run a simple markdown/link check where available

If the correct destination is not public, I will leave a clear maintainer question instead of guessing.