Docs: change PostCSS link to match 'Sass compiler' one in Getting Started > Install page

Author: julien-deramond

site/src/content/docs/getting-started/install.mdx

@@ -10,7 +10,7 @@ aliases:
 
 ## Install
 
-Pull in Bootstrap’s **source files** into nearly any project with some of the most popular package managers. No matter the package manager, Bootstrap will **require a [Sass compiler]([[docsref:/guides/contribute#sass]]) and [PostCSS](https://github.com/postcss/postcss)** for a setup that matches our official compiled versions.
+Pull in Bootstrap’s **source files** into nearly any project with some of the most popular package managers. No matter the package manager, Bootstrap will **require a [Sass compiler]([[docsref:/guides/contribute#sass]]) and [PostCSS]([[docsref:/guides/contribute#postcss]])** for a setup that matches our official compiled versions.
 
 Package managed installs don't include documentation or our full build scripts. You can also [use any demo from our Examples repo](https://github.com/twbs/examples) to quickly jumpstart Bootstrap projects.