fix(integrations): fix icons, redirects, and empty expandables

[janelletam]

[linear-code]

DOCS-116

[greptile-apps]

Greptile Summary

This PR fixes three categories of issues in the integrations documentation: brand icons for WhatsApp, Telegram, and Messenger are switched from generic Lucide icons to real simple-icons equivalents (with the icon bundle updated accordingly); several new redirects are added and the existing /tutorial redirect is corrected to include the baseUrl prefix; and empty <Expandable> sections in SchemaFields.tsx are suppressed by adding Object.keys().length > 0 guards.

• astro.config.mjs: Adds five redirects (all using ${baseUrl} for relative paths, one external), fixes the pre-existing /tutorial redirect, and registers whatsapp, telegram, messenger in the simple-icons bundle.
• SchemaFields.tsx: Guards both the object and array expandable rendering paths against empty property maps, preventing hollow collapsible UI elements.
• introduction.mdx: Updates card icons to brand icons, updates the WhatsApp href to the /introduction subpage, and capitalizes the page title.

Confidence Score: 4/5

Safe to merge after confirming the /desk external URL is correct and verifying Telegram/Messenger card links reach their intended pages.

The SchemaFields fix is straightforward and correct. The redirect and icon changes are low-risk, but the /desk external URL (https://desk.support.channel/) is unusual and could silently misdirect users if it's a typo, and the Telegram/Messenger hrefs may point to non-existent routes if those guides have the same structure as WhatsApp.

astro.config.mjs (the /desk redirect destination) and introduction.mdx (Telegram/Messenger card hrefs)

Important Files Changed

Filename	Overview
astro.config.mjs	Fixes /tutorial redirect to include baseUrl, adds five new redirects, and expands simple-icons bundle to include whatsapp, telegram, and messenger; the /desk external URL warrants a quick double-check
src/components/integrations/SchemaFields.tsx	Adds Object.keys().length > 0 guards for both object and array expandables to prevent rendering empty collapsible sections; fix is correct and safe
src/content/docs/integrations/get-started/introduction.mdx	Switches card icons to real brand icons (simple-icons), updates WhatsApp href to /introduction subpage, and capitalizes page title; Telegram and Messenger hrefs keep trailing-slash paths unlike WhatsApp

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["/tutorial"] -->|redirect| B["baseUrl/tutorial/introduction"]
    C["/integrations"] -->|redirect| D["baseUrl/integrations/get-started/introduction"]
    E["/integrations/integration-guides/whatsapp"] -->|redirect| F["baseUrl/.../whatsapp/introduction"]
    G["/integrations/integration-guides/hitl"] -->|redirect| H["baseUrl/.../hitl/introduction"]
    I["/studio"] -->|redirect| J["baseUrl/studio/introduction"]
    K["/desk"] -->|redirect| L["https://desk.support.channel/"]

    style L fill:#ffe0b2,stroke:#f57c00
    style K fill:#ffe0b2,stroke:#f57c00

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