[website] reorder preview platform tabs

[Simek]

Why

Refs:

• https://github.com/expo/expo/pull/26351#discussion_r1447872140

How

Reorder preview platform tabs to match order specified in writing guidelines:

• https://github.com/expo/expo/blob/main/guides/Expo%20Documentation%20Writing%20Style%20Guide.md#referencing-android-ios-and-web

Test Plan

The chanage has been reviewed locally. All lint checks are passing.

Preview