For all big page reloads, we want the `<head>` of the page to start
being transmitted even while doing database requests.
So let’s use the `Wai.ResponseStream` to do exactly that. The handler
provides the contents of `<head>`, we start streaming that, meanwhile
it calculates the `<body>` and once that is ready transmits it.
This means we can load all our static resources before the page
even starts sending any body data, meaning the css and html is already
there when we reach `</html>`.
Sweet.
The `<title>` in `artistPage` was depending on the table data, so I
moved it into a separate SELECT.
We can do all of it in parallel as well. Sweet.
~~~
This also adds static file prefetching of source maps if provided.
Change-Id: Ib824430594733b4c8e86ee1096c8afba2df1a66d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/13221
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI
b1403a5e94