[Feature Request] Show subtasks on task status page

[bartvanb]

Problem description
When a task is in progress, the task detail page shows which algorithm containers are running. However, subtasks are not yet included there.

Desired solution
Show the status of new algorithm containers when they are started up.

Additional context
Depends on #137

[bartvanb]

This depends on knowing the subtasks, which may be obtained either from the API by polling or via the socket connection (#84). The socket is the preferred solution as we ultimately want that to be implemented over polling

[bartvanb]

• Show subtasks on status part
• Include link to go to child page
• Include link to go to parent page