update architecture diagram in readme (#506)

<!-- .github/pull_request_template.md -->

## Description
<!-- Provide a clear description of the changes in this PR -->

## 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
-->

## Summary by CodeRabbit

- **Documentation**
  - Updated README formatting for improved consistency.
- Adjusted image display size from 50% to 80% to enhance visual
presentation.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

README.md

@@ -200,7 +200,7 @@ cognee framework consists of tasks that can be grouped into pipelines.
 Each task can be an independent part of business logic, that can be tied to other tasks to form a pipeline.
 These tasks persist data into your memory store enabling you to search for relevant context of past conversations, documents, or any other data you have stored.
 <div align="center">
-<img src="assets/cognee_diagram.png" alt="cognee concept diagram" width="50%" />
+<img src="assets/cognee_diagram.png" alt="cognee concept diagram" width="80%" />
 </div>