Allow binding of non-prefixed key

Hi! Thank you for this plugin, it is a huge leap forward from the clunky native yanking experience.

In my workflow, I am used to assign non-prefixed keybindings for my most common actions. Would it be possible to have an option to specify this in the configuration? I can also write the PR for it if needed.

Look at the configuration parsing and keybinding setup in the codebase, likely in files like config.go or keybindings.go. Understand how tmux keybindings are currently defined with a prefix. The change involves adding an option to allow non-prefixed bindings. Test by modifying the configuration and verifying keybindings work without the tmux prefix in a tmux session.

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