Update contextual settings with all options

[manototh]

Documentation changes

The contextual settings section currently miss some of the available values:
- perplexity
- mcp
- cursor
- `vscode

This PR updates this section to align with Contextual menu.

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[ethanpalm]

Thanks for this contribution, @manototh! I am going to push a small change to the descriptions of the MCP options in the menu and will get this merged. Appreciate you taking the time to help improve the Mintlify docs ✨