get rid of setup function

[teto]

would it be possible to replace the setup function with vim.g.http_codes variable for the reasons mentioned at https://mrcjkb.dev/posts/2023-08-22-setup.html ?
I installed the software and was expecting it to work out of the box since it's very simple but nothing was available so I looked at https://github.com/barrett-ruth/http-codes.nvim/blob/main/lua/http-codes.lua and found out I could run require('http-codes.fzf-lua').pick() with success. The setup could be lazyloaded run without any user intervention. Having to call setup myself makes the plugin extra-hard to use.

[barrett-ruth]

I agree. Can you write a PR for it? Thanks!