fix(py/samples/evaluator-demo): restore flow samples after accidental deletion and modify README

[MengqinShen]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @MengqinShen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses the accidental deletion of several Python flow samples within the evaluator-demo directory. It restores these crucial sample flows by re-importing them into the main application entry point. Concurrently, the README.md has been updated to accurately list the available flows and simplify the documentation around running evaluations, focusing on the Dev UI experience.

Highlights

• Flow Samples Restoration: Restored several Python flow samples (e.g., dog_facts_eval_flow, index_pdf, pdf_qa, simple_echo, simple_structured, setup) that were accidentally deleted from the evaluator-demo directory.
• README Update: Modified the README.md file to accurately reflect the restored flows and streamline the documentation, removing detailed sections on CLI-based and programmatic evaluation in favor of a consolidated list of available flows and a focus on the Dev UI.

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[gemini-code-assist]

Code Review

This pull request restores several flow samples by adding their imports to main.py and simplifies the README.md to focus on the Dev UI. My review includes two suggestions: one to reorder imports in main.py to follow PEP 8 conventions, and another to re-add a note in the README.md about a long-running flow to manage user expectations. Both are aimed at improving code quality and user experience.

[yesudeep]

Do we not need to run these commands anymore?