Document Module Usage

**Your Godot version:**
4.x
**Issue description:**
For those building from source, It'd be very useful to have a list of all the modules one can disable, with a short explanation for each module what it does and what it may be used for, as there are modules that aren't self evident as to what they do without digging into them.
**URL to the documentation page (if already existing):**
Doesn't Exist