Update README.md

Deprioritize vcpkg instructions by just clarifying that vcpkg is an
install source. This is not a primary installation source, and it is
still using version 0.20, so there's no reason to elevate it into a
separate heading.

README.md

@@ -18,7 +18,7 @@ git clone -b v0.21 https://github.com/zeux/meshoptimizer.git
 
 Alternatively you can [download the .zip archive from GitHub](https://github.com/zeux/meshoptimizer/archive/v0.21.zip).
 
-The library is also available as a package ([ArchLinux](https://aur.archlinux.org/packages/meshoptimizer/), [Debian](https://packages.debian.org/libmeshoptimizer), [Ubuntu](https://packages.ubuntu.com/libmeshoptimizer), [Vcpkg](https://github.com/microsoft/vcpkg/tree/master/ports/meshoptimizer)).
+The library is also available as a Linux package in several distributions ([ArchLinux](https://aur.archlinux.org/packages/meshoptimizer/), [Debian](https://packages.debian.org/libmeshoptimizer), [Ubuntu](https://packages.ubuntu.com/libmeshoptimizer)), as well as a [Vcpkg port](https://github.com/microsoft/vcpkg/tree/master/ports/meshoptimizer) (see [installation instructions](https://learn.microsoft.com/en-us/vcpkg/get_started/get-started)).
 
 ### Installing gltfpack
 
@@ -37,10 +37,6 @@ meshoptimizer is distributed as a set of C++ source files. To include it into yo
 
 The source files are organized in such a way that you don't need to change your build-system settings, and you only need to add the files for the algorithms you use.
 
-## Installing from vcpkg
-
-The meshoptimizer port in [vcpkg](https://github.com/Microsoft/vcpkg) is kept up to date by Microsoft team members and community contributors. You can download and install meshoptimizer using the vcpkg dependency manager, [Getting Started](https://github.com/microsoft/vcpkg#getting-started).
-
 ## Pipeline
 
 When optimizing a mesh, you should typically feed it through a set of optimizations (the order is important!):