cleanup: remove distribution specific task files and strip dns renewal hook

Remove the specific task files for each distribution and replace them with a dict in the defaults. Furthermore, remove the fixed deploy hook from the DNS challenge mode and provide ways to extend the lego cmd.

assigned to @l.seipel

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• 53b98f09 - refactor: make a clear distinction between certbot and lego

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• 026672dd - other: add better example in readme

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merged

mentioned in commit 5f4c6a35