Update Windows build documentation (#4413)

This moves CMake to be our top supported build method, with Qt creator
being lower priority now.

BUILDING_ON_WINDOWS_WITH_VCPKG.md

@@ -1,28 +1,38 @@
 # Building on Windows with vcpkg
 
+This will require more than 30GB of free space on your hard drive.
+
 ## Prerequisites
 
-1. Install [Visual Studio](https://visualstudio.microsoft.com/) with "Desktop development with C++" (~9.66 GB)
-1. Install [CMake](https://cmake.org/) (~109 MB)
-1. Install [git](https://git-scm.com/) (~264 MB)
-1. Install [vcpkg](https://vcpkg.io/) (~80 MB)
+1. Install [Visual Studio](https://visualstudio.microsoft.com/) with "Desktop development with C++"
+1. Install [CMake](https://cmake.org/)
+1. Install [git](https://git-scm.com/)
+1. Install [vcpkg](https://vcpkg.io/)
    - `git clone https://github.com/Microsoft/vcpkg.git`
    - `cd .\vcpkg\`
    - `.\bootstrap-vcpkg.bat`
    - `.\vcpkg integrate install`
    - `.\vcpkg integrate powershell`
    - `cd ..`
-1. Configure the environment for vcpkg
-   - `set VCPKG_DEFAULT_TRIPLET=x64-windows`
-     - [default](https://github.com/microsoft/vcpkg/blob/master/docs/users/triplets.md#additional-remarks) is `x86-windows`
-   - `set VCPKG_ROOT=C:\path\to\vcpkg\`
-   - `set PATH=%PATH%;%VCPKG_ROOT%`
+1. Configure the environment variables for vcpkg.  
+    Check [this document](https://gist.github.com/mitchmindtree/92c8e37fa80c8dddee5b94fc88d1288b#setting-an-environment-variable-on-windows) for more information for how to set environment variables on Windows.
+   - Ensure your dependencies are built as 64-bit  
+     e.g. `setx VCPKG_DEFAULT_TRIPLET x64-windows`  
+     See [documentation about Triplets](https://learn.microsoft.com/en-gb/vcpkg/users/triplets)  
+     [default](https://github.com/microsoft/vcpkg/blob/master/docs/users/triplets.md#additional-remarks) is `x86-windows`
+   - Set VCPKG_ROOT to the vcpkg path  
+     e.g. `setx VCPKG_ROOT <path to vcpkg>`  
+     See [VCPKG_ROOT documentation](https://learn.microsoft.com/en-gb/vcpkg/users/config-environment#vcpkg_root)
+   - Append the vcpkg path to your path  
+     e.g. `setx PATH "%PATH%;<path to vcpkg>"`
+   - For more configurations, see https://learn.microsoft.com/en-gb/vcpkg/users/config-environment
+1. You may need to restart your computer to ensure all your environment variables and what-not are loaded everywhere.
 
 ## Building
 
 1. Clone
    - `git clone --recurse-submodules https://github.com/Chatterino/chatterino2.git`
-1. Install dependencies (~21 GB)
+1. Install dependencies
    - `cd .\chatterino2\`
    - `vcpkg install`
 1. Build