fix(doc): point examples to new location

[vigith]

(pynumaflow-lite) ➜  pynumaflow git:(fix-doc) ✗ lychee README.md
  23/23 ━━━━━━━━━━━━━━━━━━━━ Finished extracting links
🔍 23 Total (in 1s) ✅ 23 OK 🚫 0 Errors

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.88%. Comparing base (af19d43) to head (568165b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #288      +/-   ##
==========================================
+ Coverage   93.85%   93.88%   +0.03%     
==========================================
  Files          66       66              
  Lines        3009     3009              
  Branches      155      155              
==========================================
+ Hits         2824     2825       +1     
+ Misses        135      134       -1     
  Partials       50       50              

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