Build new left side menu
Initial Menu content:
Root menu: [Icon] Identity Provider
Sub menu: OAuth
Sub menu: SAML
Root manu: [Icon] User profile
Root menu: [Icon] Other Services
Root menu: [Icon] Authentication
Sub menu: Realms
Sub menu: Flows
Sub menu: Routes
All pages hooked with menu items points to empty pages.
The list of menu items is incomplete at this point and may change.