That's great! Having an API is much more convenient than being forced to send users to an external site. The good thing about a solution like Steemconnect is though that if a site was attacked using XSS the attacker couldn't sniff any passwords since those are entered only on the Steemconnect site, that's what I meant about password security.

The components are available in the TravelFeed repo under MIT license on https://github.com/travelfeed-io/travelfeed-io/tree/master/components/Onboarding To see them in action you can go through the sign-up process on https://travelfeed.io/join

Material UI also has an excellent documentation available on https://material-ui.com/getting-started/installation/