Realised that I forgot to explain this flag. Show an example of it usage
and output, and describe some of the reasoning behind why it's there.

As we've completed all the tasks we've defined, we can remove this file
for now. It no longer shows upcoming things that we have to do.

"Open" sounded a bit ambiguous to me.

The wording seemed a bit confusing before. Change it to make it clear
that you're supposed to add a new "projects" block to the config.

I personally think this tool "vastly improves" upon the Chrome
extension. After all, it's much more flexible, and it lives in the
console, both of which are immense pluses.

Split the example code onto multiple lines to improve readability.

I thought it would be cool if we showed off an example connecting
`timetasker` with another shell command.