Provide empty configuration file (`application.properties`) in the binary distribution

The documentation lists the useful configuration properties for Polaris: https://polaris.apache.org/releases/1.1.0/configuration/

This documentation also mentions how the configuration properties can be set. Especially, it says:

```
3. Settings in $PWD/config/application.properties file.
```

But I think it's confusing for users regarding the binary distribution, because they actually have to create (if needed), `server/config/application.properties` and `admin/config/application.properties`.

I propose:
1. To update the documentation to clearly mention the right `application.properties` locations (in `server` and `admin`).
2. To provide `server/config/application.properties` and `admin/config/application.properties` in the binary distribution (empty, with all properties commented).

Start with the linked configuration documentation and inspect the binary distribution layout for the server and admin directories. Update the documentation to name both application.properties locations, add empty files with commented properties to the distribution, and verify the resulting archive contains server/config/application.properties and admin/config/application.properties.

Written by the indexing model from the issue text.