docs: cleanup/polish Markdown files (#5038)

Fixed some language ✨stuff✨.
    Added alternative to httpbin.
    Updated expected space requirement on Windows.
    Removed unused VS component on Windows.
    Moved Qt Creator formatting to Windows docs.
    Updated nativs link to Qt 6.
    Added missing language to code blocks.
    Removed # Description from PR template and added instructions to fix a GitHub issue.

Co-authored-by: Wissididom <30803034+Wissididom@users.noreply.github.com>
Co-authored-by: pajlada <rasmus.karlsson+github@pajlada.com>

BUILDING_ON_WINDOWS_WITH_VCPKG.md

@@ -8,12 +8,16 @@ This will require more than 30GB of free space on your hard drive.
 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 ..`
+
+   ```shell
+   git clone https://github.com/Microsoft/vcpkg.git
+   cd vcpkg
+   .\bootstrap-vcpkg.bat
+   .\vcpkg integrate install
+   .\vcpkg integrate powershell
+   cd ..
+   ```
+
 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  
@@ -31,15 +35,19 @@ This will require more than 30GB of free space on your hard drive.
 ## Building
 
 1. Clone
-   - `git clone --recurse-submodules https://github.com/Chatterino/chatterino2.git`
+   ```shell
+   git clone --recurse-submodules https://github.com/Chatterino/chatterino2.git
+   ```
 1. Install dependencies
-   - `cd .\chatterino2\`
-   - `vcpkg install`
+   ```powershell
+   cd .\chatterino2\
+   vcpkg install
+   ```
 1. Build
-   - `mkdir .\build\`
-   - `cd .\build\`
-   - (cmd) `cmake .. -DCMAKE_TOOLCHAIN_FILE=%VCPKG_ROOT%/scripts/buildsystems/vcpkg.cmake`
-   - (ps1) `cmake .. -DCMAKE_TOOLCHAIN_FILE="$env:VCPKG_ROOT/scripts/buildsystems/vcpkg.cmake"`
-   - `cmake --build . --parallel <threads> --config Release`
-1. Run
-   - `.\bin\chatterino2.exe`
+   ```powershell
+   cmake -B build -DCMAKE_TOOLCHAIN_FILE="$Env:VCPKG_ROOT/scripts/buildsystems/vcpkg.cmake"
+   cd build
+   cmake --build . --parallel <threads> --config Release
+   ```
+   When using CMD, use `-DCMAKE_TOOLCHAIN_FILE=%VCPKG_ROOT%/scripts/buildsystems/vcpkg.cmake` to specify the toolchain.
+1. Run `.\bin\chatterino2.exe`