Merge issue-22-content-aggregator branch into master

resolves #22 content aggregator component

See merge request antora/antora-direct!13
3 jobs for master in 2 minutes and 49 seconds (queued for 48 seconds)
Status Job ID Name Coverage
  Setup
passed #37347614
yarn

00:01:42

 
  Verify
passed #37347615
lint

00:01:06

passed #37347616
test

00:01:06