Improve documentation and minor bug fixes

Fix

• metrological_streams: Fixed computational error for batches of size more than one (686bad5)
• agents: Fixed buffer.clear method, which did not work anymore after moving from memory to buffer

Documentation

• README: Include the Zenodo DOI banner and add the Citation section (4a57dd8)
• docstrings: Seriously improve docstrings and type hinting in agents.py and dashboard/LayoutHelper.py

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