refactor: start pulling out the prr config into a plugin

All the prr code review stuff will be in its own plugin soon. There are
some sweet features coming with a treesitter parser for syntax
highlighting.

site-modules/core/files/vim/ftplugin/prr.vim

@@ -1,31 +0,0 @@
-"
-" function for the `foldexpr` to fold git diffs and hunks
-"
-" Inspired from https://github.com/sgeb/vim-diff-fold
-"
-function! s:fold_diff_hunk()
-    let l:line=getline(v:lnum)
-
-  if l:line =~# '^> \(diff\|Index\)'
-        return '>1'
-    elseif l:line =~# '^> \(@@\|\d\)'
-        return '>2'
-    elseif l:line =~# '^> \*\*\* \d\+,\d\+ \*\*\*\*$'
-        return '>2'
-    elseif l:line =~# '^> --- \d\+,\d\+ ----$'
-        return '>2'
-    else
-        return '='
-    endif
-endfunction
-
-setlocal foldenable
-setlocal nomodeline formatoptions-=croq formatoptions+=tl
-setlocal foldmethod=expr
-setlocal foldexpr=s:fold_diff_hunk()
-setlocal foldlevel=99
-
-" Add "go to definition" mapping for prr lines. This will allow you to go to
-" the line of code when reviewing a pull request. Seeing the code in full
-" context is really helpful when reviewing.
-noremap <silent> gd :PrrGoToLine<cr>

site-modules/core/files/vim/plugin/prr.lua

@@ -1,25 +0,0 @@
-vim.api.nvim_create_user_command("PrrGoToLine", function()
-  local content = vim.api.nvim_buf_get_lines(0, 0, -1, false)
-  local line, column = unpack(vim.api.nvim_win_get_cursor(0))
-
-  local target_file = ""
-  local target_line = 0
-
-  for i = 1, line do
-    local line_content = content[i]
-    local file_match = line_content:match "> diff .* b/(.*)"
-    if file_match ~= nil then
-      target_file = file_match
-    end
-
-    local line_match = line_content:match "+(%d+)"
-    if line_match ~= nil then
-      target_line = line_match
-    elseif line_content:match "> (-).*" == nil then
-      target_line = target_line + 1
-    end
-  end
-
-  vim.cmd("e " .. target_file)
-  vim.fn.cursor(target_line - 1, column)
-end, { bang = true, desc = "Open the current file at the poin in a prr buffer" })