Refactoring and cleanup

[ncode]

This pull request includes significant updates to the README.md file, enhancements to the command-line interface, and improvements to the ACL manager's functionality. The most important changes are grouped by theme below.

Documentation Updates:

• README.md: Updated project description, added a table of contents, expanded feature list, and detailed sections on getting started, development setup, usage, and contributing. [1] [2] [3]

Command-Line Interface Enhancements:

• cmd/root.go: Added a syncInterval flag to specify the interval between sync operations and improved error handling messages. [1] [2] [3] [4] [5]
• cmd/run.go: Introduced signal handling for graceful shutdown and added logging for the ACL manager loop. [1] [2]
• cmd/runOnce.go: Improved error messages and ensured proper closing of the ACL manager. [1] [2]

Codebase Improvements:

• pkg/aclmanager/aclmanager.go: Refactored to use the ROLE command for node discovery, added mutex for thread safety, and improved ACL synchronization logic. [1] [2] [3] [4] [5] [6] [7] [8]

Miscellaneous:

• configs/development/vault/setup.sh: Updated the Vault setup script to wait for the Vault server to start on the correct hostname.

These changes collectively enhance the usability, maintainability, and functionality of the Bedel project.

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 10 lines in your changes missing coverage. Please review.

Project coverage is 95.11%. Comparing base (b9dd2b1) to head (13bb4cf).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/aclmanager/aclmanager.go	93.75%	7 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
+ Coverage   94.58%   95.11%   +0.53%     
==========================================
  Files           1        1              
  Lines         240      307      +67     
==========================================
+ Hits          227      292      +65     
- Misses         10       11       +1     
- Partials        3        4       +1     

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