Adds a text-only mode that focuses on documentation files,
offering a simplified tutorial generation process.

Updates repository crawling to support direct HTTPS clones
for public repositories.

Refactors prompt construction and token counting for file
analysis to enhance tutorial generation logic.

…with TypedDict for shared state

- Introduced core abstractions and design patterns in core_abstractions.yaml for LLM workflows.
- Added detailed agentic coding steps and best practices in responses.yaml to guide AI agent development.
- Updated main.py to include a TypedDict definition for the shared state, improving type safety and clarity.
- Adjusted shared dictionary initialization and flow execution to utilize the new TypedDict structure.
- Enhanced VSCode settings to include additional spell check words.