Split standard-user tasks page into "tasks page" vs "tasks management page"

[tcompa]

The management page would look like the current one.

The tasks page would look very much like the discussion in #654.

[tcompa]

Side comment (no action needed): where should the following feature live?

As part of #658, this is within the tasks-management page, which makes sense because that's the kind of separation we introduced (a read-only page that shows all available tasks, and one for the actual operations).

At some point in the future we may want to review this, and move the "Edit single task" button to the tasks list page. But I don't have a strong opinion here, and I would wait for some additional feedback (even after the merge&release).

In general I think that editing tasks should be quite rare, for the use flows that we typically have in mind.

[jluethi]

At some point in the future we may want to review this, and move the "Edit single task" button to the tasks list page. But I don't have a strong opinion here, and I would wait for some additional feedback (even after the merge&release).

I think it's well placed where it is. Editing tasks would be a task management operation. And it's good if the task management page has a simple overview of the task packages, while the main task page has our new fancy view on it :)