Validate and update links (STF-557)

[oschwald]

Adds a lychee link checker configuration and a Links GitHub Actions workflow (push, pull request, weekly schedule, and manual dispatch) so stale or redirecting links are caught automatically going forward. max_redirects is 0 so moved links surface and can be updated to their canonical destination.

Validated all links with lychee and updated those that redirected elsewhere:

• https://dev.maxmind.com/geoip/docs/web-services -> https://dev.maxmind.com/geoip/docs/web-services/ (CLAUDE.md)
• https://dev.maxmind.com/geoip/docs/web-services?lang=en -> https://dev.maxmind.com/geoip/docs/web-services/?lang=en (README.md, lib/maxmind/geoip2/client.rb, lib/maxmind/geoip2/model/city.rb, lib/maxmind/geoip2/model/enterprise.rb, lib/maxmind/geoip2/model/insights.rb)
• https://dev.maxmind.com/geoip/docs/databases?lang=en -> https://dev.maxmind.com/geoip/docs/databases/?lang=en (README.md)
• https://www.maxmind.com/en/correction -> https://www.maxmind.com/en/geoip-data-correction-request (README.md)
• https://www.maxmind.com/en/support -> https://support.maxmind.com/knowledge-base (README.md, 2 occurrences)

Historical CHANGELOG.md entries are intentionally left unchanged (excluded from scanning).

Final lychee run: 34 Total, 28 OK, 0 Errors, 6 Excluded. RuboCop passes on all edited Ruby files.

Part of STF-557.

🤖 Generated with Claude Code

[gemini-code-assist]

Code Review

This pull request configures the Lychee link checker by adding a lychee.toml configuration file, ignoring its cache in .gitignore, and updating various documentation URLs across several markdown and Ruby files to their canonical or updated destinations. Feedback on the configuration suggests not ignoring 5xx server errors globally, as this can mask broken links, and instead relying on Lychee's built-in retry mechanism.

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[gemini-code-assist]

Accepting all 500..=599 status codes means that any link returning a server error (such as 500 Internal Server Error, 502 Bad Gateway, or 504 Gateway Timeout) will be treated as valid and won't be caught by the link checker. This can hide permanently broken links or dead servers.\n\nTo handle transient network or server issues without ignoring all server errors, it is recommended to rely on Lychee's built-in retry mechanism (e.g., setting retry = true or max_retries) instead of accepting 5xx status codes globally.

Suggested change

	accept = ["100..=103", "200..=299", "403", "429", "500..=599", "999"]
	accept = ["100..=103", "200..=299", "403", "429", "999"]

[oschwald]

Keeping 500..=599 in accept, matching the dev-site and blog-site configs — transient upstream 5xx shouldn't fail link-checking CI.

— Claude (posted on Greg's behalf)