docs: update sample app links to correct sdk-sample-apps paths

[vatsalparikh]

Summary

• Updated stale sample app links in README.md and packages/javascript-sdk/README.md to point to their correct locations in the sdk-sample-apps repo
• All four samples (embedded login, central login, React Todo, Angular Todo) now point to archived paths since those are the ones that use @forgerock/javascript-sdk; the active samples have migrated to newer modular clients

Test plan

• Verify all four sample links in root README.md resolve correctly on GitHub
• Verify the .env.example path in packages/javascript-sdk/README.md Getting Started steps resolves correctly

[changeset-bot]

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Latest commit: 9652ddf

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☁️ Nx Cloud last updated this comment at 2026-06-25 22:49:03 UTC

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commit: 9652ddf

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.72%. Comparing base (60e6ffb) to head (9652ddf).
⚠️ Report is 9 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #589      +/-   ##
===========================================
- Coverage    58.53%   56.72%   -1.81%     
===========================================
  Files          105      105              
  Lines        28448    28457       +9     
  Branches      1802     1644     -158     
===========================================
- Hits         16652    16143     -509     
- Misses       11796    12314     +518     

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