feat: move prompts to a separat file

lua/chatgpt_nvim/ui.lua

@@ -1,6 +1,7 @@
 local M = {}
 local config = require('chatgpt_nvim.config')
 local conf = config.load()
+local prompts = require('chatgpt_nvim.prompts')
 
 local debug_bufnr = nil
 if conf.improved_debug then
@@ -29,7 +30,9 @@ end
 
 function M.pick_directories(dirs)
   local selected_dirs = {}
-  local lines = { "Delete lines for directories you do NOT want, then save & close (e.g. :wq, :x, or :bd)" }
+  local selection_instructions = prompts["file-selection-instructions"]
+  local lines = { selection_instructions }
+
   for _, d in ipairs(dirs) do
     table.insert(lines, d)
   end
@@ -88,8 +91,4 @@ function M.pick_directories(dirs)
   return selected_dirs
 end
 
---------------------------------------------------------------------------------
--- The old chunkify method has been removed, since we now rely on step-by-step
---------------------------------------------------------------------------------
-
-return M
+return M