Revert "chore: Remove coding-tutor plugin from marketplace"

This reverts commit d4d31c1614.

plugins/coding-tutor/commands/sync-tutorials.md

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+# Sync Coding Tutor Tutorials
+
+Commit and push your tutorials to the GitHub repository for backup and mobile reading.
+
+## Instructions
+
+1. **Go to the tutorials repo**: `cd ~/coding-tutor-tutorials`
+
+2. **Check for changes**: Run `git status` to see what's new or modified
+
+3. **If there are changes**:
+   - Stage all changes: `git add -A`
+   - Create a commit with a message summarizing what was added/updated (e.g., "Add tutorial on React hooks" or "Update quiz scores")
+   - Push to origin: `git push`
+
+4. **If no GitHub remote exists**:
+   - Create the repo: `gh repo create coding-tutor-tutorials --private --source=. --push`
+
+5. **Report results**: Tell the user what was synced or that everything is already up to date
+
+## Notes
+
+- The tutorials repo is at: `~/coding-tutor-tutorials/`
+- Always use `--private` when creating the GitHub repo
+- This is your personal learning journey - keep it backed up!