Add regions to Keyboard layout help index

With over 900 layouts available, plus 300 deprecated ones, the help page can be confusing to navigate. To make it more user-friendly, I suggest simply ordering the layouts by region. This approach would allow users to save time and make the page more helpful and faster to find the desired keyboards.
The regions I propose using are the ones listed on Unicode 16.0 Character Code Charts, which are already used for organizing scripts. Ordering keyboards by region is more intuitive than ordering by script, and it avoids potential problems. By categorizing the 960+ keyboards into regions, the page would be easier to use.

Please don’t repeat post under multiple names