Graphics blog mod

[hobbes7878]

Let's add a mod that converts a project to a graphics blog.

• Add to mods CLI.
  • Ideally, this would be another option for changing project type, but whereas embed-only or pages+ are reversible, updating to a graphics blog would not be and we should thereafter remove those options from the CLI.
  • User MUST have created a RNGS.io storyboard during project setup to use this mod.
• Update RNGS.io docs:
  • Remove content.json from locales/en/ and rngs-io.json
  • Optionally, delete page-en story from RNGS.io (requires update to rngs-io-client)
  • Create over page story from blog-page template
  • Create first post from blog-post template
• Update npm scripts in package.json
  • Add script to create additional posts from blog-post template.
  • Remove stories:new, stories:connect, stories:live, get-google, lock-google (will be RNGS.io-only)
• Changes to pages/:
  • +layout.ts (replace)
  • +layout.svelte (replace)
  • +page.svelte (replace)
  • embeds/en/page/+page.svelte (remove)
  • [date]/[slug]/+page.ts (add)
  • [date]/[slug]/+page.svelte (add)
• Changes to src/lib/:
  • App.svelte (remove)
  • Post.svelte (add)
  • components/Post/... (add)
  • components/TableOfContents/... (add)
  • styles/global.scss (replace)
• Add docs.