* feat(bin): add `crawl.ts` script to detect broken links & images

* chore(ci): attach `crawl` CI step

* fix(bin/crawl): separate message counts

* manual: update broken links & images

* chore(ci): move `crawl` into "Compiles" step

* Apply suggestions from code review

Co-authored-by: Sohei Okamoto <sohei.okamoto@gmail.com>

* chore: update remaining links

* chore: final link fixes

* chore: link fix

Co-authored-by: Sohei Okamoto <sohei.okamoto@gmail.com>