✨ NEW: Mention pausing of processes

[giovannipizzi]

trafficstars

As suggested by @chrisjsewell:

Should we mention in the basics about paused processes?

• that a process can be paused if e.g. a connection cannot be established to a remote computer
• you can look at verdi process report <PK> to see the reason for the pause
• you can pause/unpause processes

[mbercx]

I'll leave this to you, @ramirezfranciscof! Might also be good to mention in a module on dealing with calcjob errors.