chore!: upgrade mdex to 0.13

[halostatue]

If a Tableau blog uses MDEx syntax highlighting, the latest version of MDEx has breaking changes to how syntax highlighting works and your blog configuration must be modified for it to continue working.

There are two supported syntax highlighters: Lumis (tree-sitter) and Syntect (Sublime Text grammars). Tableau includes the Lumis syntax highlighter package, but it is not fully configured without modification to the blog config/config.exs for selecting the appropriate syntax highlighting NIF:

config :mdex_native, syntax_highlighter: :lumis
config :mdex_native, syntax_highlighter: :syntect

The MDEx options configuration must also be updated:

      render: [unsafe: true],
      syntax_highlight: [
-         formatter: {:html_inline, theme: "neovim_dark"}
+         engine: :lumis,
+         opts: [formatter: {:html_inline, theme: "neovim_dark"}]
      ],
      plugins: [MDExGFM]

More details for each syntax highlighter can be found at https://mdex.hexdocs.pm/lumis.html or https://mdex.hexdocs.pm/syntect.html.

[halostatue]

Note that this builds on #184 (which is why there are two commits).

[mhanberg]

Thanks, this looks straightforward.

I'm going to try this branch on my personal blog before merging.

Note to self: update the tableau_new mix archive as well.

[halostatue]

I think the biggest trick is going to be making sure that the new version's release notes are clear on what needs to be done because it's not quite a routine release.

I haven't been able to get my latest blog published, but that's an infra issue on my end not a Tableau problem where I was using the git version yesterday for everything.