Start dotnet compiler in package.json instead of snowpack.config.js

[MichaelMay81]

Snowpacks plugin-run-script seems buggy:

• Not running script before build (e.g., https://github.com/withastro/snowpack/issues/3095)
• Not killing child processes (e.g., https://github.com/sindresorhus/execa/issues/433)

Proposed solution: Instead of starting dotnet fable inside snowpack.config.js, start int in package.json

"scripts": {
    "postinstall": "dotnet tool restore",
    "dev": "dotnet fable watch src -o dist --run snowpack dev",
    "prebuild": "dotnet fable src -o dist",
    "build": "snowpack build",
    "clean": "rm -r dist build"
  },

[MichaelMay81]

'devOptions: { output: "stream" }' gives better output with dotnet not being started by snowpack