Added Notion and Linear integrations, Browser extensions and Tagging users

• 🔌✏️ Userback is now connected with Notion
  Notion is the all-in-one workspace that combines notes, docs, project management, and wikis — and makes them all customizable. Tens of thousands of teams and companies around the world use it to collaborate, stay informed, and get more done together.
• 🔌⚡ Userback is now connected with Linear
  Linear lets you manage software development and track bugs. Linear's streamlined design is built for speed and efficiency — helping high-performing teams accomplish great things.

Fixes & Updates

• Feedback Type has been added as a selectable field to the Userback Browser Extension.
• The ability to @mention Users has been extended to the Feedback Viewer