How can I build a site like Facebook Ai/ Google Ai?

I am looking for an open source repository that I can use to build a website with functionality/design like Facebook AI https://ai.facebook.com or iGenius https://igenius.ai. Main purpose of my site is to publish research papers, provide APIs, and possibly authenticating certain users for API dashboard access.

I know I can create very expressive sites on Webflow, etc but I would like to avoid vendor lock-ins and want the flexibility to host it anywhere. I am also going to be integrating with other APIs so preferably would like to be able to access the source code or ability to plug in my APIs

Can someone explain how to build such a site effectively and/or share any great repositories you know of?

Thank you!