add promo blocks

[adam-cowley]

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[recrwplay]

Looks good to me. The cleanest way I can find to add sidebar and promos to pages is:

• Set an attribute in a playbook for courses path in github: ga-courses-uri: https://raw.githubusercontent.com/neo4j-graphacademy/courses/main/asciidoc/courses
• Set a header attribute on the page for the course to link to: :ga-course: app-go
• Add the sidebar ad by adding header attribute: include::{ga-courses-uri}/{ga-course}/ad.adoc[]
• Add a promo to the end of the page: include::{ga-courses-uri}/{ga-course}/promo.adoc[]

Possibly overkill to set the ga-course attribute (in this case it means typing more characters) but a header attribute could be accessed by a script, which might have future value.

[adam-cowley]

Sounds good. I'm not sure if the ad.adoc file will be much use for manual-wide config in antora.yml but at least there's a reference for copy & paste