Rewrite all with nuxt/content v3 and Nuxt 4+

[helltraitor]

Work must be done along with these modules:
helltraitor/nuxt-anchorscroll#13
helltraitor/nuxt-feedme#12

TODO:

1. Try to use Deno for build and ssg generation
2. Publish to helltraitor.tech
3. Try to implement comments for dynamic version
4. Put all media in public, since asset nuxt/content plugin is not supported