Updated logo

This update is nothing major but a branding update.
The overall goals of this update:

• Make the icon more easily standout when displayed at a small size like the extension’s button.
  • Make the D stand out more to prevent confusion of similarity to HS logo.
  • Remove the HubL brackets - they’re impossible to see at small size and they don’t look great.
  • Remove white glow behind icon(it was intentionally hardly noticeable, it was there to make the logo more visible on certain screens but I don’t think it’s necessary in the new design.)

This update is rolling out to everyone now.