Fix badge link to docs in README

[Da-Be-Ru]

It seems that the current badge link to the supposedly deployed docs still links to a dead page.

Assuming the current organization's link is the one we would like to direct new users to, perhaps we should update it? Throws me off every time I want to check out the docs again 😅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.14%. Comparing base (8c7883a) to head (03437ed).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #194   +/-   ##
=======================================
  Coverage   99.14%   99.14%           
=======================================
  Files          21       21           
  Lines        1292     1292           
=======================================
  Hits         1281     1281           
  Misses         11       11           

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[MilesCranmer]

Thanks!