Documentation improvements

[pi0]

(this is a collection of previous common questions that could end up in a recipes or explanations section of the docs) -- contribution is more than welcome!

Explainers:

• Explain passive watcher / JIT compilation (nice article by @antfu ) (from Document "passive watcher" usage #265)
• Explain inlineDependencies (from More details about the option inlineDependencies #376)

Recipes:

• Mkdist dual format (from cannot build to cjs using mkdist #311)
• Decorators (from Decorators support #309)

Usage:

• Source map usage (from sourcemap support does not work out of the box #348)

[RSS1102]

🫡will try to understand and contribute.