add support for asciidoc partials

[gdams]

Description of change

This will make translating pages much simpler

Checklist

• npm test passes
• documentation is changed or added (if applicable)
• permission has been obtained to add new logo (if applicable)
• contribution guidelines followed here

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[codecov]

Codecov Report

Merging #2214 (8091eb6) into main (51a635f) will not change coverage.
Report is 4 commits behind head on main.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2214   +/-   ##
=======================================
  Coverage   99.20%   99.20%           
=======================================
  Files          87       87           
  Lines        6504     6504           
  Branches      554      554           
=======================================
  Hits         6452     6452           
  Misses         52       52           

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