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docs(frontend): remove confusing suggestion to manually create users (#3465)

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datahub-frontend/README.md
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@ -22,25 +22,6 @@ However, if you only want to build `DataHub Frontend` specifically:
Before starting `DataHub Frontend`, you need to make sure that [DataHub GMS](../metadata-service) and
all its dependencies have already started and running.
Also, user information should already be registered into the DB,
otherwise user will not be able to sign in.
To do that, first create a file named `user.dat` containing below line and filling the parts `<<something>>`
with your information:
```
{"auditHeader": None, "proposedSnapshot": ("com.linkedin.pegasus2avro.metadata.snapshot.CorpUserSnapshot", {"urn": "urn:li:corpuser:<<username>>", "aspects": [{"active": True, "fullName": "<<Full Name>>", "email": "<<e-mail address>>"}, {}]}), "proposedDelta": None}
```
And run `mce producer` script as below:
```
python metadata-ingestion/mce_cli.py produce -d user.dat
```
Or, you can run the script without providing any data file. In this case, the script will use `bootstrap_mce.dat` file
to bootstrap some sample users and datasets:
```
python metadata-ingestion/mce_cli.py produce
```
This will create a default user with username `datahub`. You can sign in to the app using `datahub` as your username.
## Start via Docker image
Quickest way to try out `DataHub Frontend` is running the [Docker image](../docker/datahub-frontend).
@ -57,7 +38,8 @@ into your favorite web browser:
```
http://localhost:9001
```
To be able to sign in, you need to provide your user name. You don't need to type any password.
To be able to sign in, you need to provide your user name. The default account is `datahub`, password `datahub`.
## Authentication
DataHub frontend leverages [Java Authentication and Authorization Service (JAAS)](https://docs.oracle.com/javase/7/docs/technotes/guides/security/jaas/JAASRefGuide.html) to perform the authentication. By default we provided a [DummyLoginModule](app/security/DummyLoginModule.java) which will accept any username/password combination. You can update [jaas.conf](conf/jaas.conf) to match your authentication requirement. For example, use the following config for LDAP-based authentication,