🚚(keycloak) rename Impress to Meet

I have updated all references of "Impress" to "Meet".

Few environment variables were updated, keycloak was including
the realm's name as a base URL for API endpoints.

README.md

@@ -34,8 +34,8 @@ $ make bootstrap FLUSH_ARGS='--no-input'
 Then you can access to the project in development mode by going to http://localhost:3000.
 You will be prompted to log in, the default credentials are:
 ```bash
-username: impress
-password: impress
+username: meet
+password: meet
 ```
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