chore: update install.sh URL to vellum.ai and clean up old user-hosted onboarding logic#16798

dvargasfuertes merged 3 commits into

mainvellum-ai/vellum-assistant:mainfrom

devin/1773526313-cleanup-old-user-hosted-and-install-urlvellum-ai/vellum-assistant:devin/1773526313-cleanup-old-user-hosted-and-install-urlCopy head branch name to clipboard