Sorted "Frameworks, Engines, Higher Level Rendering" section and added Vulkan Launchpad

[johannesugb]

This pull request suggests the following updates:

• Alphabetically sorts the entries under section Frameworks, Engines, Higher Level Rendering (as they should be).
• Adds Vulkan Launchpad and Vulkan Launchpad Starter to section Frameworks, Engines, Higher Level Rendering
• Renames entry Introductory Vulkan sample to Introductory Vulkan sample by GPUOpen in order to describe which introductory Vulkan sample that is to avoid confusion (with, e.g., the Vulkan Tutorial).