[Documentation] How can I enable python source logging to a mezmo log analysis destination?

I haven't found the documentation here to be very straightforward. I think I'm supposed to create a new pipeline in order to establish a destination (in this case, the mezmo log analysis destination). When I added the ingestion key to the logger (via `LogDNAHandler`) in my python code, it doesn't end up sending out any logs.

Not sure what my `source` is supposed to be in this pipeline. I originally added `HTTP` since that seemed to be the closest match for using a code library, but that doesn't seem right as the `key` doesn't serve any purpose.

Any guidance here is appreciated.

Start with the LogDNAHandler usage and the pipeline/source documentation, focusing on the ingestion key and Mezmo Log Analysis destination described in the issue. Done means the Python setup, required source, and expected logging path are documented clearly enough for a user to send logs successfully.

Written by the indexing model from the issue text.