Task: Add missing provinces

There is a separate page with a list of all provinces: https://vietnamguru.ru/content/reference/aktualniy-spisok-provintsiy-vetnama

Currently, there are several provinces there that are not in our database (pages have not been created for them). We need to add all of them and include links to them.

Along the way, we need to develop a comprehensive province page to display cities, places, etc., within it.