Somewhere along the line since 2.3 the packaged bbb-html5.nginx regressed to a
state where the upstream for /html5client was Meteor itself, which means nginx
wasn't serving static assets as it was supposed to.
Guarantees that nginx will be the one serving the WASM binaries (static assets).
The types block is there to guarantee that the correct MIME type is advertised.
Moreoever, it's preferable that the WASM binaries are gzipped because they're
too large to ignore, so it's worth the server-side gzipping overhead.
The explicit gzip type declaration is there because only text/html assets are
compressed by default.
