docs: Remove images from git tracking

docs: Comprehensive rewrite of observability article

researched community voice to have the article target that audience.

removed mermaid diagram.

removed outdated docs

Track images with Git LFS

Add observability article draft with platform comparison and illustrative screenshots for OpenAI, Phoenix, and Weave. Includes new images in instructional_docs/images/.

docs: update README and tests documentation

feat: create comprehensive tutorial test suite

feat: standardize tracing metadata across CLI and Gradio

feat: enhance agent prompt and add OpenAI tracing metadata

Refactor test suite for AI Engineers 101 article focus

Update gradio app with existing modifications

Clean up comments across agent files for consistent minimal style

refactor: clean up test files with minimal comments