Make the /e/ calendar app icon render the current date
Summary
Make the /e/ calendar app icon render the current date.
This feature concerns
Description
Who will use the new feature?
Anybody who has the Calendar icon shown on the screen.
What is the target of the new feature for this user?
To show an actual valid information, instead of "May 7" as it is with 0.9-20200626259
Why this user would like to use this feature?
Current date can be shown by the Calendar icon.
Examples
## Reflection
Mockups
Diagrams