feat: Add support for custom configuration files

[kevintyj]

What is the purpose of this PR?

Adds the ability for users to input a explicit javascript configuration file path for commitlint

ClickUp/Jira/Github project ticket number(s)?

What did you do?

Add a GitHub action input cl-config for the file path for commitlint on the repository.
README updated to reflect changes

How do we test it?

Vitest tests passing & coverage unchanged.

Checklist before merging

• Added tests where necessary
• Performed a self-review of my code
• Ensure all acceptance criteria are met
• Implemented the UI as exactly as the design (applicable only for UI changes)
• Added comments for codes where hard-to-understand
• Haven't pushed unnecessary files (ex: .env, .map)
• Haven't ignored Typescript warnings in the code (if do so add a comment with the reason)

Provide screenshot details of the PR

[optional] Tests passed screenshot

[optional] Breaking changes after PR

Anything else?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@43be185). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff            @@
##             main        #9   +/-   ##
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  Coverage        ?   100.00%           
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  Files           ?         4           
  Lines           ?       123           
  Branches        ?        23           
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  Hits            ?       123           
  Misses          ?         0           
  Partials        ?         0           

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