[docs] Add how to publish to partitioned topics content  (#8481)
[docs] Add how to publish to partitioned topics content  (#8481)

### Motivation
In the original Cookbook, there are some content related to "partitioned topics". It's not easy for users to find topics information here and there.

### Modifications
1. Remove the partitioned topics content from Cookbook. See #8478 
2. Add those content in "Topics".
3. Add detailed info about routing mode.

yahoo/pulsar,massakam/pulsar,merlimat/pulsar,massakam/pulsar,yahoo/pulsar,massakam/pulsar,massakam/pulsar,massakam/pulsar,yahoo/pulsar,massakam/pulsar,yahoo/pulsar,merlimat/pulsar,merlimat/pulsar,merlimat/pulsar,merlimat/pulsar,yahoo/pulsar,yahoo/pulsar,merlimat/pulsar