refactor: fix dir_path option in config and add comments

lua/img-clip/config.lua

@@ -1,7 +1,7 @@
 local M = {}
 
 local defaults = {
-  dir_path = "assets/",
+  dir_path = "assets",
   filename = "%Y-%m-%d-%H-%M-%S",
   prompt_for_filename = true,
   include_filepath_in_prompt = false,
@@ -22,24 +22,28 @@ M.get_option = function(key, opts)
   local ft = vim.bo.filetype
   local val
 
+  -- check options passed explicitly to pasteImage function
   if opts and opts[key] ~= nil then
     val = opts[key]
 
-  -- Check for filetype-specific option
+  -- otherwise chck for filetype-specific option
   elseif M.options[ft] and M.options[ft][key] ~= nil then
     val = M.options[ft][key]
+
+  -- otherwise check for global option
   elseif M.options[key] ~= nil then
     val = M.options[key]
+
+  -- return nil if no option found
   else
     vim.notify("No option found for " .. key .. ".", vim.log.levels.WARN, { title = "img-clip" })
     return nil
   end
 
-  -- Check if the option is a function and execute it
   if type(val) == "function" then
-    return val() -- Execute the function and return its result
+    return val() -- execute the function and return its result
   else
-    return val -- Return the option value directly
+    return val
   end
 end