docs: enable strict mode for broken link checking

[mrbojangles3]

No description provided.

[github-actions]

🚀 Deployed on https://preview-123--hedgehog-docs.netlify.app

[qmonnet]

Great to have these fixes! Not sure about making --strict a default just yet though, see below.

[Frostman]

It doesn't break the serve command, it's still INFO level:

docs on  strict_docs_build [$] took 4s810ms 
15:16:14 ➜  just serve
[15:16:17] docker run -q --pull=always --rm -v $(pwd):/docs -p 8000:8000 ghcr.io/githedgehog/hhdocs:20241202 mkdocs serve --strict -a 0.0.0.0:8000
WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
INFO    -  Building documentation...
INFO    -  Cleaning site directory
INFO    -  Doc file 'reference/fab-api.md' contains a link '#prefix', but there is no such anchor on this page.
INFO    -  Doc file 'reference/fab-api.md' contains a link '#addr', but there is no such anchor on this page.
INFO    -  Doc file 'reference/fab-api.md' contains a link '#prefixordhcp', but there is no such anchor on this page.
INFO    -  Doc file 'reference/fab-api.md' contains a link '#fabricmode', but there is no such anchor on this page.
INFO    -  Doc file 'reference/fab-api.md' contains a link '#alloyconfig', but there is no such anchor on this page.
INFO    -  Doc file 'reference/fab-api.md' contains a link '#version', but there is no such anchor on this page.
INFO    -  Doc file 'reference/fabric-api.md' contains a link '#map[string]switchstatebgpneighbor', but there is no such anchor on this page.
INFO    -  Doc file 'reference/fabric-api.md' contains a link '#map[string]vpcpeer', but there is no such anchor on this page.
INFO    -  Doc file 'reference/fabric-api.md' contains a link '#nostype', but there is no such anchor on this page.
INFO    -  Doc file 'reference/fabric-api.md' contains a link '#redundancytype', but there is no such anchor on this page.
INFO    -  Documentation built in 3.38 seconds
INFO    -  [22:16:23] Watching paths for changes: 'docs', 'mkdocs.yml', 'includes', 'overrides'
INFO    -  [22:16:23] Serving on http://0.0.0.0:8000/

[qmonnet]

Ah, I forgot about that. OK, fine by me in that case

[qmonnet]

Thanks!