An alle, die dies sehen (auch eine Notiz an mein zukünftiges Ich):
Warten Sie, bis der Build abgeschlossen ist, und führen Sie localhost:4200 anstelle von localhost:3000 aus 
Build-erfolgreich-Nachricht:
Build successful (45326ms) – Serving on http://localhost:4200/
Slowest Nodes (totalTime >= 5%) | Total (avg)
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