The UG doesn't directly declare postcss as a dev dependency: see

• https://github.com/google/docsy/blob/main/userguide/package.json

And yet it builds just fine. The same is now true of the OTel website. Am I missing something?

The postcss-cli has postcss as a dependency, so why would projects be required to install it explicitly?

If y'all agree, then we should drop from the docs the occurrences of the following statement:

Starting in version 8 of postcss-cli, you must also separately install postcss:

E.g., see, https://www.docsy.dev/docs/get-started/docsy-as-module/installation-prerequisites/#install-postcss.

/cc @deining @geriom @LisaFC