Summary: PostHog adds "PostHog AI" to install instructions

Why It Matters: This change highlights a new way to install PostHog. It shows they are making it easier for users to get started with their AI features.

What Changed:

• The text "PostHog AI" was added under the "Terminal" heading in the "Install with AI in 90 seconds" section.
• The number of companies that signed up today changed from 424 to 633.