At some point moved from hljs pure source to their CDN assets, but we
did not change the way we created the HLJS bundle. The CDN asset comes
with their "common" languages already included, so we were duplicating
around 35 languagues in the bundle we create.
This patch includes a list of their current common langs so we never
double bundle those.
Changes in size are significant. Numbers before minimization/compression
are 747.53 KB before and 117.57 KB after.
