PR: Remove Legacy plugins/ Directory from Repo

[DJJones66]

🧹 PR: Remove Legacy plugins/ Directory from Repo

Summary

This PR cleans up the repository by removing the obsolete plugins/ directory from source control. The directory is no longer maintained in the core repo, but developers may still keep a local copy if needed. To prevent future tracking, it is now added to .gitignore.

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🔧 Changes Made

• Removed plugins/ directory from version control (git rm --cached).
• Added /plugins/ rule to .gitignore to ensure it is ignored going forward.
• Kept local developer copies untouched — files remain available on disk after checkout, but are no longer tracked by Git.

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✅ Benefits

• Reduces repository bloat by removing unused code/assets.
• Prevents accidental commits of local plugin experiments or builds.
• Keeps local developer workflows intact while ensuring the remote repo stays clean.

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📎 Related Context

• Part of ongoing repo cleanup tasks to streamline plugin handling and move toward the unified installer approach.
• Complements previous work removing deprecated local plugin installation paths.