Change plugin to accept "theme" and "layout_config" through telescope extensions setup

[alefpereira]

Change plugin to accept configuration through telescope extensions setup like:

local telescope = require 'telescope'
telescope.setup{
  extensions = {
    live_grep_raw = {
      vimgrep_arguments = {...},
      theme = 'dropdown',
      mappings = {i={...}, ...},
      ...
    }
  }
}
telescope.load_extension('live_grep_raw')

[alefpereira]

@weeman1337 just updated README.md with configuration and usage examples, also removed WIP indication. Just waiting for your review. Thanks!

[weeman1337]

@alefpereira thank you for your contribution. This was blocked by renaming this repo, which is done now.

Can you please update your branch? Parts of it are already implemented now.

[weeman1337]

Hey @alefpereira :wave: Can you update the branch and see what already has been implemented during other tasks? In not getting feedback for a while I will assume this PR to be obsolete and going to close it.

[alefpereira]

Hi @weeman1337 , sorry I couldn't get this earlier. Already working on the rebase and the changes. Will push it asap. Thanks.

[alefpereira]

Hi @weeman1337 , apart from the "theme" and "layout_config" options, it turns out basically all the change was already there, thanks, nice job with the quoting thing, really liked it btw.

Since this is just about theme now, i'm changing the title and the commit message.

[weeman1337]

Thanks for the contribution @alefpereira