THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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With Antora, these assets are shared via the UI bundle that's used, which provides the overall theme for the entire documentation site.
A UI bundle is not merely directories of CSS and JS files, it's a .zip archive which has been compiled and generated with Gulp.
A very important thing to note here is the assumption is that the UI bundle is maintained in a completely separate repo and compiled into "releases" - this won't work for us...