Remove mobile from docs

[sjmiller609]

TL;DR

Removed documentation for mobile proxies as the product is being deprecated.

Why we made these changes

The mobile proxy product is being deprecated. This PR removes the associated documentation to prevent user confusion and clean up related content.

What changed?

• Deleted proxies/mobile.mdx, the primary documentation page for mobile proxies.
• Updated proxies/overview.mdx to remove all references to mobile proxies.
• Added a new section to the overview page clarifying the trade-offs between the remaining proxy types (Datacenter, ISP, and Residential).

Validation

• Verify the mobile proxy documentation page results in a 404 on the deployed site.
• Search the deployed site for "mobile proxy" to ensure no references remain.
• Confirm that navigation elements no longer link to the removed page.

^{Description generated by Mesa. Update settings}

[dprevoznik]

I still see Mobile listed in the sidebar. Looks good otherwise

[mesa-dot-dev]

Performed full review of 3f2b7a4...f94585d

Analysis

1. The removal of mobile proxies represents a significant feature discontinuation without clear migration guidance for existing users who may be relying on this proxy type.

2. The reordering of proxy types with new prioritization (Datacenter → ISP → Residential → Custom) shifts emphasis from stealth to speed, which may impact use cases where detection avoidance was the primary concern.

3. The architectural simplification removes an entire proxy category, potentially limiting the product's versatility in certain geotargeting scenarios that were previously supported.

4. The documentation changes appear reactive to availability limitations rather than proactive product evolution, suggesting possible underlying infrastructure or partnership issues.

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