Docs: Make coordinator instructions generic

[odudex]

Description

This PR aims to minimize the maintenance of documentation for individual coordinators by providing a draft with more generic instructions for setting up coordinators and transaction signing.

What is the purpose of this pull request?

• [ ] Bug fix
• [ ] New Feature
• [X] Documentation update
• [ ] Other

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.64%. Comparing base (690357b) to head (b23396c). Report is 11 commits behind head on release-24.07.0.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-24.07.0 #416 +/- ## ================================================ Coverage 94.64% 94.64% ================================================ Files 57 57 Lines 7073 7073 ================================================ Hits 6694 6694 Misses 379 379 ```

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[tadeubas]

Nice idea!

[jdlcdl]

Excellent!