* Modified STARTUP to include more instructions around startup project and solution platform

* updated gif

* added link to UWP version of WinComp samples

* Update README.md

Co-authored-by: Jesse Bishop <16565497+jesbis@users.noreply.github.com>

* Update README.md

Co-authored-by: Jesse Bishop <16565497+jesbis@users.noreply.github.com>

* Update README.md

Co-authored-by: Jesse Bishop <16565497+jesbis@users.noreply.github.com>

* Update STARTUP.md

Co-authored-by: Jesse Bishop <16565497+jesbis@users.noreply.github.com>

* Update STARTUP.md

Co-authored-by: Jesse Bishop <16565497+jesbis@users.noreply.github.com>

* Fixes to markdown

* Changed commit link to tag link

* changed string for product name

Co-authored-by: Jesse Bishop <16565497+jesbis@users.noreply.github.com>

Adding the name and page_type metadata entries so this sample will show up in https://docs.microsoft.com/samples/browse/?expanded=windows&products=windows-app-sdk

Fix #361

This pr is auto merged as it contains a mandatory file and is opened for more than 10 days.

Fix a minor typo

Fix typo

Fixes:
1. Updates from .NET 5 (not supported) to .NET 6 (LTS)
2. Removing UWP-only APIs
3. Fixing modern C# compiler warnings.

Update NuGet packages:
1. WASDK 1.5
2. Win2D
3. Build Tools
4. VCRT Forwarders

Getting the SceneNode sample to work again:
- Update for .NET 8 (LTS), needed for CsWinRT fixes around MemoryBuffer.
- Create a modern SamplePackage project to ensure no legacy UWP holdover.
- Remove older NuGet "win10-" style to become just "win-" style.

Fixes for Issue 367

Moved samples to WinAppSDK and make this repo read-only.