support asciidoctor page variables

[maxandersen]

I have xam.dk that has a mix of markdown and asciidoc on a jekyll site - and for the asciidoc content there is. no frontmatter but instead use of asciidoc variables starting with :page-*

i.e.

= A Journey Down the QRCode Rabbit Hole with 12 Monkeys
:page-layout: post
ifdef::env-github,env-browser,env-vscode[:imagesdir: ../] 

here starts main doc

this allows having the same .adoc file be reused/moved around nicely.

with this roq currently fails.

jekyll docs on it: https://github.com/asciidoctor/jekyll-asciidoc?tab=readme-ov-file#creating-pages

[ia3andy]

I am'not sure how we could do this, template rendering (asciidoc) is happening way down the line at runtime. All the data and routing stuff is already done at deployment....

We could parse it manually like frontmatter I suppose but that would be weird no?

[maxandersen]

Yeah - since you'll need to support ifdef/if def for it to be really useful.

[jtama]

If we do so, we will have to introduce a common mechanism between the 2 asciidoc extensions