Add coffee unlink Command

[tareknaser]

Description

This pull request adds the coffee unlink command and renames the coffee setup command to coffee link.
Fixes #278

Changes

• Rename setup Command to link
  • Change function names from setup_* to link_* (e.g., setup_with_cln to link_with_cln)
  • Update command references in httpd and plugin crates
  • Update documentation
• Add coffee unlink Command
  • Add methods in coffee_core to enable unlinking coffee configuration from CLN configuration
  • Update coffee_cmd crate to include the new unlink command
  • Add documentation for the unlink command

Note: The commits are organized so that the renaming of coffee setup is in one commit, and the addition of coffee unlink is in a separate commit. The clightningrpc-conf from git is required to use the rm_subconf() method.

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[vincenzopalazzo]

ACK 20be671

Thanks!

[vincenzopalazzo]

ops CI shows a break

    Checking brotli v3.4.0
   Compiling derive_more v0.99.17
error[E0282]: type annotations needed for `Box<_>`
Error:   --> /home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/time-0.3.34/src/format_description/parse/mod.rs:83:9
   |
83 |     let items = format_items
   |         ^^^^^
...
86 |     Ok(items.into())
   |              ---- type must be known at this point
   |
help: consider giving `items` an explicit type, where the placeholders `_` are specified
   |
83 |     let items: Box<_> = format_items
   |              ++++++++

   Compiling actix-router v0.5.2
For more information about this error, try `rustc --explain E0282`.
error: could not compile `time` (lib) due to 1 previous error

[tareknaser]

Hmmm
It looks like the error is in the nightly build and appears to be a dependency issue, which doesn't seem related to this PR.

Update
Just noticed I got the same error on master branch CI: https://github.com/tareknaser/coffee/actions/runs/9190931675/job/25276264891

Let me investigate this further

[vincenzopalazzo]

ACK c3f842c