Problem:
scripts/check_urls.vim manually matches urls in the help pages and then
synchronously checks them via curl/wget/powershell. This is extremely
slow (~5 minutes for Nvims runtime on my machine) and prone to errors in
how the urls are matched.
Solution:
- Use Tree-sitter to find the urls in the help pages and `vim.net.request` to
check the responses.
- Add a `lintdocurls` build task and check it in CI (every Friday).
- Reopens a dedicated issue if it finds unreachable URLs.
- Drop the old check_urls.vim script.
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