docs(README): update README with new env vars

README.MD

@@ -1,13 +1,27 @@
 # Node UI
+The Node UI is the primary interface for admins of the node installation at participating institutions. With this 
+website, the administrators have access to an overview of the submitted projects and analyses that wish to make use of 
+the data at the data center, as well as have full control over the individual containers running on their systems and 
+manage which projects/analyses have access to the various datasets.  
+
 ## Needed `.env`
+This frontend requires the following environment variables to be set. While some appear as though they can be 
+auto-generated (e.g. the keycloak endpoints), they cannot be since the SSR framework used for this project (Nuxt) 
+requires the environment variable to be precisely named and explicitly defined in order to overwrite the 
+default configuration.
 ```dotenv
 NUXT_PUBLIC_BASE_URL="http://localhost:3000"  # URL of the website
 NUXT_PUBLIC_HUB_ADAPTER_URL="http://urlForHubAdapterApi.de"  # URL for hub adapter API
 
-NUXT_OIDC_PROVIDERS_KEYCLOAK_BASE_URL="http://your.keycloak.instance.de/realms/flame"
 NUXT_OIDC_PROVIDERS_KEYCLOAK_CLIENT_ID="node-ui"
 NUXT_OIDC_PROVIDERS_KEYCLOAK_CLIENT_SECRET="someSecret"
 
+# The following need to be explicitly set in order to apply them to the Nuxt config, they can't be built from the domain
+NUXT_OIDC_PROVIDERS_KEYCLOAK_REDIRECT_URI="https://my.keycloak.domain.de/auth/keycloak/callback"  # Be sure this redirect URI is defined in your keycloak for this client
+NUXT_OIDC_PROVIDERS_KEYCLOAK_AUTHORIZATION_URL="https://my.keycloak.domain.de/protocol/openid-connect/auth"
+NUXT_OIDC_PROVIDERS_KEYCLOAK_TOKEN_URL="https://my.keycloak.domain.de/protocol/openid-connect/token"
+NUXT_OIDC_PROVIDERS_KEYCLOAK_USERINFO_URL="https://my.keycloak.domain.de/protocol/openid-connect/userinfo"
+
 # Nuxt OIDC Tokens
 # https://nuxt.com/modules/nuxt-oidc-auth#_3-set-secrets
 # NOTE: These will automatically be generated in helm/docker so they do not need to be explicitly set