docs: add fzf-lua and nu_plugin_skim to the README

[LoricAndre]

Checklist

check the box if it is not applicable to your changes

• I have updated the README with the necessary documentation
• I have added unit tests
• I have added end-to-end tests
• I have linked all related issues or PRs
• I have re-generated the completions and manpage using cargo xtask compgen and cargo xtask mangen

Description of the changes

closes #570
closes #418

[LoricAndre]

@idanarye, @ibhagwan could you please take a look and see if you're all right with this ?

[ibhagwan]

  -- optional for icon support
  dependencies = { "nvim-tree/nvim-web-devicons" },

I'm not sure if we need this part, although nice to have there's also mini.icons (part of the amazing mini.nvim) which is also used by default with LazyVim - perhaps it's better to direct users to the repo's README for more options instead?

[LoricAndre]

I'll merge this tomorrow if it's good with you two

[ibhagwan]

I'll merge this tomorrow if it's good with you two

Looks great, Ty @LoricAndre!

[jasha-hrp]

@LoricAndre it looks like these Readme updates got clobbered -- the README on master no longer has nushell plugin informatrion.

[LoricAndre]

Hmmm you're right, I need to check how that happened

[LoricAndre]

OK sorry about this, it's a dumb mistake on my part, I'll revert it right away

[LoricAndre]

@jasha-hrp thank you very much for noticing this, it should be fixed now !