Acutally implement a login in the demo app

package.json

@@ -23,10 +23,14 @@
     "license": "MIT",
     "keywords": [],
     "dependencies": {
+        "evt": "^2.4.1",
+        "jwt-decode": "^3.1.2",
+        "keycloak-js": "^21.0.1",
         "keycloakify": "^6.12.1",
+        "powerhooks": "^0.26.2",
         "react": "18.1.0",
         "react-dom": "18.1.0",
-        "evt": "^2.4.1"
+        "tsafe": "^1.4.3"
     },
     "devDependencies": {
         "@types/node": "^15.3.1",
@@ -41,7 +45,9 @@
             "react-app/jest"
         ],
         "rules": {
-            "react-hooks/exhaustive-deps": "off"
+            "react-hooks/exhaustive-deps": "off",
+            "@typescript-eslint/no-redeclare": "off",
+            "no-labels": "off"
         }
     },
     "browserslist": {