docs(lab-server): add Keycloak setup step

lab-server/CONTRIBUTING.md

@@ -5,12 +5,15 @@ Please also see the [contribution guide in the root folder](../CONTRIBUTING.md).
 ## Prerequisites
 
 - Install [<img
+  alt="docker-logo"
   src="https://user-images.githubusercontent.com/58258541/143049489-668aea70-bb2c-420d-b3e8-e0edc42a4e92.png"
   width="16" height="16"> Docker](https://docs.docker.com/get-docker/)
 - Install [<img
+  alt="nodejs-logo"
   src="https://user-images.githubusercontent.com/58258541/143050266-4a2030d1-c319-447d-812b-2ad8a4020d48.png"
   width="16" height="16"> NodeJS](https://nodejs.org)
 - Install [<img
+  alt="yarn-logo"
   src="https://user-images.githubusercontent.com/58258541/143050227-b374b1f7-e28e-4b90-b7f0-b9112521d3b1.png"
   width="16" height="16"> Yarn](https://yarnpkg.com/)
 - Create an `.env` file with required variables (see `.env.example`)
@@ -49,6 +52,7 @@ Please also see the [contribution guide in the root folder](../CONTRIBUTING.md).
     - `access-type` "public" ("Client authentication" off)
     - set the redirect URI to `localhost:/*` (as specified in
       `callbackUrlScheme` in `app/lib/login/pages/cubit.dart`)
+  - In `Authentication > Required actions` disable `Verify Profile`
 - Create a user for testing (you can choose username and password freely, no
   roles are required); when setting the password, set "Temporary" to "OFF"
 - For more information see