New docs for filter, enrichment, transformation rule nodes

[dskarzh]

PR description

• New structure of rule node docs
• New documentation content for filter, enrichment, transformation rule nodes

Link checker

The links will be checked by the build agent automatically once you create or update your PR.

You can use the following command to check the broken links locally.

docker run --rm -it --network=host --name=linkchecker ghcr.io/linkchecker/linkchecker --check-extern --no-warnings http://0.0.0.0:4000/

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ dskarzh
❌ d2eight
_{You have signed the CLA already but the status is still pending? Let us recheck it.}