Summary: Synthesia adds free AI Video Generator.

Why It Matters: This change makes it easier for people to try Synthesia.

What Changed:

• Update the link for "Get started" to include "www."
• Add a new section called "free demo."
• Add a new heading "Try out our free AI Video Generator."
• Add steps for using the free AI Video Generator.
• Add example videos for the free AI Video Generator.
• Add a script input box for the free AI Video Generator.
• Add a new heading "You’ll get your video via email in minutes."
• Update the link for "Book demo" to include "www."
• Update the link for "Learn more about pricing" to include "www."
• Update the link for "all available plans" to include "www."
• Update the link for "ethics policy" to include "www."
• Remove "Avatars's Voice" text.
• Remove "Default-redirect" text.
• Remove "Avatar: Alex" text.