Returns instructions and provides examples for using PropelAuth's frontend APIs to create custom UIs to replace PropelAuth's hosted pages. Examples include login and signup pages, MFA flows, managing organizations, inviting, removing, or updating users in an organization, managing and creating API keys, updating the user's email, verifying MFA, the org member table, api key tables, updating user properties, updating org membership, and more. Before installing any component, make sure to use the 'Installation' guidance first. If instructed to build a login or signup related UI, use the 'LOGIN_AND_SIGNUP_INSTALLATION' guidance first.