feat: link to relevant docs from --help output

[angeloashmore]

Description

Add a LEARN MORE line to commands that have corresponding documentation pages. Since prismic docs view already exists, the hint would look like:

LEARN MORE
  prismic docs view nextjs/with-cli#create-pages

This could be driven by an optional docs field in CommandConfig so buildCommandHelp() generates it automatically.

[angeloashmore]

See the anchors in the temporary Next.js CLI docs: npx prismic docs list nextjs/with-cli.

The other framework guides will follow that format once we have CLI versions of them. Include /with-cli, which eventually be removed once we make it the primary way to work with Prismic.

We will need to detect which framework the project uses to print the correct docs path (nextjs, nuxt, or sveltekit). If we can't detect a framework, we can have a generic fallback, like "Use prismic docs list to find documentation".