Summary: PixAI adds 3rd Anniversary Promotion

Why It Matters: This shows PixAI is celebrating a milestone. It might mean new features or deals for users.

What Changed:

• A link to "Animation Model v3.0 PixAI" was removed.
• A new link for "3rd Anniversary Promotional PixAI" was added.
• The list of artwork examples was updated with new images and descriptions.