Ship brotli level 11 precompressed assets as part of the release archive

Ship brotli level 11 precompressed assets as part of the release archive: Currently the release archive only contains the raw uncompressed assets (js/css/etc) which are transmitted in theier full sizes to the clients. This can be improved by compressing them on the fly by the webserver, but this has two downsides: 1. there is no caching, so every request takes more cpu to compress the response and 2. to be still fast enough a lower level of compression is required, so assests are not as small as they could be. The best option would be to precompress the assests so...