feat: introduce authentication page (#1241)

* feat: introduce authentication page

* feat: update page width

* fix(saml): cover non-existing role mapping on onboarding

---------

Co-authored-by: Ali BARIN <ali.barin53@gmail.com>

packages/web/src/hooks/useSamlAuthProvider.ts

@@ -0,0 +1,20 @@
+import { useQuery } from '@apollo/client';
+
+import { TSamlAuthProvider } from '@automatisch/types';
+import { GET_SAML_AUTH_PROVIDER } from 'graphql/queries/get-saml-auth-provider';
+
+type UseSamlAuthProviderReturn = {
+  provider: TSamlAuthProvider;
+  loading: boolean;
+};
+
+export default function useSamlAuthProvider(): UseSamlAuthProviderReturn {
+  const { data, loading } = useQuery(GET_SAML_AUTH_PROVIDER, {
+    context: { autoSnackbar: false },
+  });
+
+  return {
+    provider: data?.getSamlAuthProvider,
+    loading,
+  };
+}