This should eliminate page freezes when loading big files/diff.
`highlightBlock` is needed to preserve existing nodes when highlighting
and for that, highlight.js needs access to the DOM API so I added a DOM
implementation to make it work, which adds around 300kB to the output
file size of the lazy-loaded `highlight.js`.
Co-authored-by: Lauris BH <lauris@nix.lv>
- introduced window.config to help with js-based lazy-loading
- adjusted webpack chunk naming to avoid 'vendors~name.js' that webpack
defaults to for vendor chunks.
- added theme class to html and prefixed all selectors. this is
neccesary so that the theme styles win over the lazy-loaded ones.
Co-authored-by: zeripath <art27@cantab.net>