Improve page loading times

[benStre]

Since we don't use bundlers in UIX, nested module graphs can take quite some time to resolve, which is especially noticeable with slow network connections and when opening a page for the first time.

Optimization strategies:

• We can get optimal loading times by adding <link rel=modulepreload/> tags for each nested module dependency to the initial HTML page, which gives the browser the opportunity to load all module dependencies in parallel (works great with http/2, might be even better with http/3 in the future (QUIC & HTTP/3 support denoland/deno#1558))

• Additionally, we should currently not load the rust runtime/decompiler per default, because the wasm file is quite big and normally we only need the decompiler for debugging.

• We can minify JS files on a per-module-basis to decrease the overall download size and required loading time