Fix manual installation instructions with correct CLI commands

[bstanley-pec]

I just found your plugin and am just starting with git worktrees but the install instructions that you had did not seem to work. I updated the install instructions based on what actually worked for me using Claude Code v2.1.39 (latest as of right now).

• Replaced non-existent claude plugins add command with the updated two-step process: claude plugin marketplace add followed by claude plugin install.

[harris21]

Hey @bstanley-pec, thanks for catching this — you're right that claude plugins add doesn't exist, that was a mistake in the README.

The fix isn't quite right though. You don't need to clone the repo locally — claude plugin marketplace add accepts a GitHub repo directly. So the whole installation is just:

claude plugin marketplace add harris21/laravel-herd-worktree
claude plugin install laravel-herd-worktree@harrisrafto-laravel-tools

No git clone step needed at all.

If you want to update the PR, there's also a "Publishing (For Maintainers)" section near the bottom of the README that's a bit redundant now — would be great if you could consolidate both into a single clean installation section with just those two commands.