Added Bricks shell templates

Property	Value
description	Added the global shell and error template layer for the baseline site frame.

• Added the Header Bricks template.
• Added the Footer Bricks template.
• Added the Error Bricks template.
• Applied Header globally.
• Applied Footer globally.
• Applied Error to the error view.
• Shipped the baseline with the site shell and error handling moved into Bricks templates instead of relying on stock theme output.