Update website and zine (Zig 0.13) and fix broken links

[MatthiasPortzel]

• Updates Zine for Zig 0.13
  • Frontmatter format changed to zon from JSON
  • Requires valid HTML—no self closing tags
• Updated broken links
  • regz and uf2 now point to the monorepo folder
  • Dropped the extension from the "Getting Started" link, that's now fixed
  • The Getting Started page needed some absolute links to assets since it's now a folder not a top-level file
  • Updated the ziglings link to point to Codeberg
• Deleted the "legacy-ssg" folder (hopefully that wasn't still needed)

[MatthiasPortzel]

@EliSauder I think this duplicates some work you did previously, does this look right?

[EliSauder]

Also this won't automatically deploy to the website yet since the workflows are broken (what I've been working on updating). So this should probably wait until that gets merged in to main.

[EliSauder]

Also also, we probably want to wait for the asset system redesign that kristoff is working on (should be done somewhat soon).

[EliSauder]

Resolves https://github.com/ZigEmbeddedGroup/website/issues/13

[ikskuh]

Nice work!

[ikskuh]

@EliSauder: Merging this should be fine with your changes, right?

[EliSauder]

Yeah, i just rebased some of the changes so there shouldn't be any conflicts.

[EliSauder]

@ikskuh the only remaining concern for the website is that zine has been updated. But we could have that be its own PR.

[ikskuh]

@ikskuh the only remaining concern for the website is that zine has been updated. But we could have that be its own PR.

Yeah, sounds like a good idea :)