[#INTERNAL-32] update notification centre components

[ArinzeJeffrey-droid]

Fixes #796

📸 Looks like

• git fetch
• git checkout task/internal-32-update-notification-centre-components`
• yarn
• yarn storybook
• navigate to enter component name component

Check:

• The appearance matches the design in Zeplin
• The Zeplin component is correctly linked in storybook
• The documentation for this component is correct, understandable, and up-to-date.

👾 Code changes

Check:

• The documentation for this component is correct, understandable, and up-to-date.
• The component makes good use of CSS custom properties to simplify creating variants (or doesn’t have variants).
• Everything that should be a variable, is.

[planktonic]

The ticket for this seems a little under-specified. Perhaps we could take a look in the next sprint planning?