UI mockups: introducing task_info and improving task_edit

### Describe your improvement idea or feature request

Often I'm tapping on a task to see it's details, without necessarily modifying anything. The task edit view is kind of lousy for that, as details are spread apart and span more than one screen. This set of mockups is a suggestion to address that. I would propose that on selecting a task from the task list, goes to task info view, and then, tapping on task details, goes to task edit view. On saving changes, the user should land back in task info (see changes summarized) then back to the list.
I've also illustrated a UI to create, view and edit annotations ( #382 ) although a simple text editor would be desirable.

### How would you like to see it implemented?

tedious UI fiddling

### Put here any screenshots or videos (optional)


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### Would you like to work on this issue?

None

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