feat: add codeowners

[BekahHW]

Description

• adds codeowners to pizza cli docs
• removes extension docs that no longer reflect the product
• adds pizza-action
• adds codeowners file and pizza action workflow

Related Tickets & Documents

closes #384

Mobile & Desktop Screenshots/Recordings

Steps to QA

https://deploy-preview-386--saucedocs.netlify.app/tools/pizza-cli/codeowners/

Tier (staff will fill in)

• [ ] Tier 1
• [ ] Tier 2
• [ ] Tier 3
• [ ] Tier 4

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