Add jsconfig.json even for people not wanting any type checking

[dummdidumm]

Right now the jsconfig.json is omitted if people want no type checking at all. This has a few unwanted side effects

• intellisense isn't as good anymore. The VS Code extension will make the whole thing a inferred project which has some limitations
• stuff like aliases ($lib for example) doesn't work, in the sense of if you click on the component / import path it won't take you to the definition, because intellisense has no way of knowing how to resolve it
• other quirks like https://github.com/sveltejs/language-tools/issues/2557

For this reason, the CLI should add a jsconfig regardless, just with the type checking option turned off (i.e. "checkJs": false)

[manuel3108]

Isn't this a duplicate of https://github.com/sveltejs/cli/issues/198 ?

[dummdidumm]

Ah yeah, basically yes, though this one has the more obvious title. Closing the other in favor of this one.