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## Description
Notebook and python example for cognee simple example
## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
- **New Features**
- Introduced an interactive demo showcasing asynchronous document
processing and querying for key insights from a sample text.
- **Documentation**
- Added an in-depth, step-by-step guide in a Jupyter Notebook that walks
users through setup, configuration, querying, and visualizing processed
data.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
* fix: remove groups from UserRead model
* fix: add missing system dependencies for postgres
* fix: change vector db provider environment variable name
* fix: WeaviateAdapter retrieve bug
* fix: correctly return data point objects from retrieve method
* fix: align graph object properties
* feat: add node example
