feat(#2369): add full renderer.icons.web_devicons options for file and folder (#2375)

* Add `webdev_colors_folder` option

* Check if `M.devicons` exists

* Refactor `get_folder_icon`

* Add configuration options for both files and folders

* web_devicons.*.enabled -> enable

* silent migration: renderer.icons.webdev_colors -> renderer.icons.web_devicons.file.color

* silent migration: renderer.icons.webdev_colors -> renderer.icons.web_devicons.file.color

---------

Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree/legacy.lua

@@ -38,6 +38,17 @@ local function refactored(opts)
 
   -- 2023/07/16
   utils.move_missing_val(opts, "git", "ignore", opts, "filters", "git_ignored", true)
+
+  -- 2023/08/26
+  utils.move_missing_val(
+    opts,
+    "renderer.icons",
+    "webdev_colors",
+    opts,
+    "renderer.icons.web_devicons.file",
+    "color",
+    true
+  )
 end
 
 local function deprecated(opts)