Empty States

User story

As a user, I want to be informed when there are no notes to display.

Acceptance criteria

• When there are no notes, the app should display an "empty state" illustration and text.
• When there are no searched notes, the app should display an "empty state" illustration and text with a message indicating that no matching notes were found.
• When the user filters through completed notes and there are no completed notes to display, the app should display an "empty state" illustration and text with a message indicating that there are no completed notes.
• The "empty state" illustrations and text should be visually appealing and easy to understand.