Update MCP Gateways docs

[wdawson]

Updated some pictures for better consistency. Updated VS Code examples

Still TODO:

• Cursor
• Claude Desktop
• Others?

Resolves: PLT-876

---

Note

Refreshes MCP Gateway docs and VS Code setup with new images and OAuth-based auth flow.

• Quickstart (call-tool-client): Replaces screenshots/dimensions, adds spacing, updates tool picker and gateway URL images, tweaks tool count guidance, and simplifies VS Code setup with built-in auth/start steps.
• Guides (MCP Gateways): New page with light/dark tool filter images; clarifies options (Description, new LLM Instructions), adds Authentication modes (Arcade Auth vs Arcade Headers), and Allowed Tools selection.
• VS Code client guide: Raises required version to 1.107.0, removes API key prereq for default flow, adds explicit “Start server” + OAuth prompts; moves header-based config to a note for Arcade Headers mode.
• Glossary: Updates tool execution diagram order and clarifies MCP Gateway description.

^{Written by Cursor Bugbot for commit 874ee30. This will update automatically on new commits. Configure here.}

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Project	Deployment	Review	Updated (UTC)
docs	Ready	Preview, Comment	Jan 5, 2026 9:08pm

[nearestnabors]

We have a major IA overhaul incoming that's likely to impact these pages...

[evantahler]

Thanks for keeping this updated, @wdawson!
Pleas wait on the 👍 form @nearestnabors about when to merge this - in #622, the location of many/most pages is changing

[wdawson]

@nearestnabors I'm happy to rejigger this PR. But wanted it up in case it's easy to incorporate to the overhaul or y'all had any feedback in the meantime

[nearestnabors]

New IA has shipped!

[wdawson]

@nearestnabors rebased on main!