Starting auto-reveal without a package.json present fails

[pichfl]

The way we implemented loading of config files requires them to be present.

presentations/auto-reveal on 🌱 main [?]
❯ auto-reveal .
No package.json found
No README.md found, falling back to `name` in package.json
  ➜  Local:   http://localhost:1337/
  ➜  Network: use --host to expose
  ➜  press h + enter to show help
Error:   Failed to scan for dependencies from entries:
  /Users/pichfl/Developer/mainmatter/auto-reveal/src/index.html

  ✘ [ERROR] Invalid glob: "@theme/config.json" (resolved: "reveal.js/dist/theme/config.json"). It must start with '/' or './' [plugin vite:dep-scan]

    ../../../../mainmatter/auto-reveal/node_modules/.pnpm/[email protected]/node_modules/esbuild/lib/main.js:1275:21:
      1275 │         let result = await callback({
           ╵                      ^