Sets prettier to run on the repo (#91379)

Prettier (an auto formatter) is set to only run within the tgui folder
currently. This removes that limitation, allowing it to automatically
format all supported files in the repo (.js, .html, .yml
[etc](https://prettier.io/docs/))

I made a few exceptions for bundled and generated files
I'm of the opinion that code should look uniform and am lazy enough to
want CTRL-S to format files without having to think beyond that

code/modules/mod/adding_new_mod.md

@@ -199,6 +199,7 @@ As it's a medical module, we'll put it [here](modules/modules_medical.dm). Let's
 ```
 
 As we want this effect to be on demand, we probably want this to be an usable module. There are four types of modules:
+
 - Passive: These have a passive effect.
 - Togglable: You can turn these on and off.
 - Usable: You can use these for a one time effect.
@@ -312,4 +313,5 @@ Now we want to add it to the psychological theme, which is very simple, finishin
 ```
 
 ## Ending
+
 This finishes this hopefully easy to follow along tutorial. You should now know how to make a basic theme, a skin for it, and a module.