456 exclude relative paths

[ewan-escience]

Changes in this PR

This PR excludes local files, using the scheme config.''

I've also spent many hours trying to get it to work with local files (see first commit), but I've failed and am done with it for a while. If someome wants to help me, please contact me.

closes #456

Checklist

ALL contributions

• I previewed my changes locally using e.g. python3 -m http.server 4000 and confirmed they work correctly.
• I checked for broken links, e.g. using the link checker GitHub Action workflow, or locally by using docker run --init -it -v `pwd`:/docs lycheeverse/lychee /docs --config=docs/lychee.toml, at least for the files I changed.
• My name was added to the CITATION.cff file.

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[ewan-escience]

I don't know if this will work well with the scheduled action, I guess there is only one way to find out.