Update README.md to clarify pull request submission for plugin removal

[Jack251970]

This pull request makes minor documentation improvements to the README.md file, clarifying the process for submitting and removing plugins. The main change is specifying that pull requests should be made to the default branch.

[Copilot]

Pull request overview

This pull request updates the README.md documentation to clarify the branch to which pull requests should be submitted when adding or removing plugins. The changes specify that PRs should be made to the main branch, providing clearer guidance for contributors.

Changes:

• Updated submission instructions to specify submitting pull requests to the main branch (lines 42 and 52)
• Changed formatting of MinimumAppVersion from quoted text to backticks for consistency (line 38)

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[jjw24]

Did someone create a pr against a different branch? Just wondering why we need to specify it. If really need to point out the branch they should submit against, can say 'default branch'.

[Jack251970]

Did someone create a pr against a different branch? Just wondering why we need to specify it. If really need to point out the branch they should submit against, can say 'default branch'.

Yes. Someone create a pr to plugin_api_v2 branch