More proxy configuration examples

[sjmiller609]

No description provided.

[dprevoznik]

LGTM

[mesa-dot-dev]

Mesa Description

This PR enhances the proxy documentation by adding advanced examples for residential proxy targeting and clarifying the behavior of proxy deletion.

Key Changes:

• Advanced Residential Proxy Examples: Added a new "Advanced Targeting Examples" section to the residential proxy documentation. This includes code snippets in both TypeScript/JavaScript and Python for targeting by city, state, and ASN.
• Simplified Basic Example: The initial configuration example for residential proxies was simplified by removing specific targeting to make it more straightforward for new users.
• Proxy Deletion Behavior Clarified: Updated the proxy overview to accurately reflect that when a proxy is deleted, any associated browsers are immediately re-routed to a direct internet connection.

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