Add dot_clean and clarify docs

Thanks OKonnel!

Resources/build.py

@@ -606,6 +606,8 @@ Please build OpenCore first!"""
             else:
                 print("- Adding Internal Drive icon")
                 shutil.copy(self.constants.icon_path_internal, mount_path)
+            print("- Cleaning install location")
+            subprocess.run(f"dot_clean '{mount_path}'".split(), stdout=subprocess.PIPE, stderr=subprocess.PIPE)
             print("- OpenCore transfer complete")
             print("\nPress [Enter] to continue.\n")
             input()

docs/POST-INSTALL.md

@@ -26,4 +26,4 @@ Here you can change different patcher settings, however the main 2 of interest a
 * Enable Verbose Mode
 * Set ShowPicker Mode
 
-Once you've toggled them both off, build your OpenCore EFI once again and install to your desired drive. Now to show OpenCore picker, you can simply hold the "Esc" key.
+Once you've toggled them both off, build your OpenCore EFI once again and install to your desired drive. Now to show the OpenCore selector, you can simply hold down the "ESC" key while clicking on EFI boot, then you can release the "ESC" key when you see the cursor arrow at the top left.