Quickstart update

[gvdongen]

This pull request updates the docs/get_started/quickstart.mdx file to improve the clarity and usability of the quickstart guide for the Restate SDK. The changes include enhancements to the instructions, additional visual aids, and updates to code examples to align with best practices. Below is a summary of the key updates:

Improvements to Instructions and Visual Aids:

• Updated all references to the Restate UI playground to include explicit URLs (http://localhost:9070) and added screenshots (playground.png) for better guidance. [1] [2] [3] [4] [5]
• Added a new step to demonstrate how the service handles failures by sending a request for "Alice" and showing retries in the logs and UI, along with an explanatory screenshot (quickstart_retries.png). [1] [2] [3] [4] [5]

Code and Dependency Updates:

• Simplified the Python quickstart by removing the virtual environment setup and replacing the Hypercorn server command with uv run .. Also updated the example file path for clarity. [1] [2]
• Added a prerequisite for the uv dependency in the Python quickstart section.

Durable Execution Explanation:

• Enhanced the explanation of Durable Execution by replacing textual descriptions with an interactive example and a tip admonition linking to the Durable Execution documentation page. [1] [2] [3] [4] [5]

These updates aim to make the quickstart guide more user-friendly and informative for developers using the Restate SDK.

Fixes restatedev/examples#239

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