docs(user-guide): update links for consistency + remove missing monetization links

docs/astro.config.mjs

docs/src/content/docs/en/getting-started/create-podcast.mdx

docs/src/content/docs/en/getting-started/update.mdx

docs/src/content/docs/en/index.mdx

docs/src/content/docs/en/user-guide/instance/fediverse.mdx

docs/src/content/docs/en/user-guide/instance/persons.mdx

docs/src/content/docs/en/user-guide/instance/podcast.mdx

docs/src/content/docs/en/user-guide/instance/users.mdx

docs/src/content/docs/en/user-guide/podcast/contributors.mdx

docs/src/content/docs/en/user-guide/podcast/dashboard.mdx

docs/src/content/docs/en/user-guide/podcast/index.mdx

docs/src/content/docs/en/user-guide/website/index.mdx