rustic 0.9.0 will have breaking changes in the config profile files

[aawsome]

Hi!

We are about to release rustic 0.9.0. This release will have quite some breaking changes in the config profile files as we overworked and cleaned some things there.

For an overview, see https://rustic.cli.rs/docs/breaking_changes.html

The changes can be tested using the nightly builds: https://github.com/rustic-rs/nightly

For some examples using the new syntax, see https://github.com/rustic-rs/rustic/tree/main/config