Configure `fzf.kak` better
Configure `fzf.kak` better

- Definitely not going to unlearn `<Ctrl+p>` = fuzzy-find files.
- Use `plug.kak` `defer` for better config
- Manually `require-module fzf` (normally auto-loaded in `:fzf-mode`)
- Move `: fzf-mode<ret>` (full menu) to `user F`

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