Attributes/Variables not resolved in page titles and in the footer

[szabosteve]

Describe the bug

Former AsciiDoc attributes are not resolved in page titles...

and in the footer.

Expected behavior

Former AsciiDoc attributes should be resolved in page titles and in the footer.

Steps to reproduce

1. Build the machine-learning.md doc set.
2. Go to http://localhost:3000/setup.html

Tooling

• docs-builder
• migration tooling
• I'm not sure

[marciw]

This is happening in the elasticsearch docs too -- for example, https://bookish-dollop-9p66716.pages.github.io/elasticsearch-intro.html

[karenzone]

Logstash, too.

[bmorelli25]

Related: #300, #430

[Mpdreamz]

The footer works (atleast as #458)

[Mpdreamz]

And h1 headers should now work correctly too: