Improve dev docs (#45534)

- Making the contributor-setup doc a bit easier to digest.
- Removing duplicated information
- Upgrade VS instructions/config files/scripts to VS2026

---------

Co-authored-by: Noraa Junker <noraa.junker@outlook.com>
Co-authored-by: Jeremy Sinclair <4016293+snickler@users.noreply.github.com>

.config/configuration.winget

@@ -1,5 +1,5 @@
 # yaml-language-server: $schema=https://aka.ms/configuration-dsc-schema/0.2
-# Reference: https://github.com/microsoft/PowerToys/blob/main/doc/devdocs/readme.md#compiling-powertoys
+# Reference: https://github.com/microsoft/PowerToys/blob/main/doc/devdocs/readme.md#getting-started
 properties:
   resources:
     - resource: Microsoft.Windows.Settings/WindowsSettings
@@ -13,11 +13,11 @@ properties:
     - resource: Microsoft.WinGet.DSC/WinGetPackage
       id: vsPackage
       directives:
-        description: Install Visual Studio 2022 Community (Any edition will work)
+        description: Install Visual Studio 2026 Community (Any edition will work)
         # Requires elevation for the set operation
         securityContext: elevated
       settings:
-        id: Microsoft.VisualStudio.2022.Community
+        id: Microsoft.VisualStudio.Community
         source: winget
     - resource: Microsoft.VisualStudio.DSC/VSComponents
       dependsOn:
@@ -29,7 +29,7 @@ properties:
         securityContext: elevated
       settings:
         productId: Microsoft.VisualStudio.Product.Community
-        channelId: VisualStudio.17.Release
+        channelId: VisualStudio.18.Release
         vsConfigFile: '${WinGetConfigRoot}\..\.vsconfig'
   configurationVersion: 0.2.0