docs: Refine documentation for NOVA architecture layers in Kafka implementation

- Removed analogies to brain wave patterns for the Reactive, Responsive, and Reflective layers to streamline the description.
- Clarified the processing characteristics and temporal scales of each layer.
- Enhanced overall readability and understanding of the system architecture and message flow.

These changes aim to improve clarity and focus in the documentation, making it easier for users to grasp the functionality of the NOVA architecture.

Author: leonvanbokhorst

predictive_coding/03_kafka_nova_poc.py

@@ -9,17 +9,14 @@
 -------------------
 1. Reactive Layer (50-300ms)
    - Handles immediate responses
-   - Similar to brain's gamma waves (30-100 Hz)
    - Minimal processing, quick reflexes
 
 2. Responsive Layer (300-1000ms)
    - Context-aware processing
-   - Similar to beta waves (13-30 Hz)
    - Integrates immediate context
 
 3. Reflective Layer (>1000ms)
    - Learning and adaptation
-   - Similar to alpha/theta waves (4-13 Hz)
    - Pattern recognition and long-term learning
 
 Message Flow: