web interface gives few hints about available space

[Andrea Corbellini]

TL;DR: it could be much easier to answer the question "how much space am I using and how much is available?"

What happens:

* on https://one.ubuntu.com/dashboard/ you can see how much space you are using, but not how much is available;

* on https://one.ubuntu.com/files/ the only way you have to see the used space is to sum all the file sizes;

* the only page where you can see you current storage plan is https://one.ubuntu.com/services/add-storage/ ;

* there are no hints about how much space is available.

What should happen:

/dashboard/ and /files/ should tell you how much space is being used, what the current storage plan is and optionally how much space is available.