docs: replace broken links with Web Archive versions in FAQ

[chansuke]

While reading the documentation, I found unavailable links

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 47.22%. Comparing base (8849c3f) to head (fed0abd). :warning: Report is 55 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #753      +/-   ##
==========================================
- Coverage   54.26%   47.22%   -7.05%     
==========================================
  Files          64       64              
  Lines        6164     6529     +365     
==========================================
- Hits         3345     3083     -262     
- Misses       2549     3191     +642     
+ Partials      270      255      -15     

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