Update sorting, user guide and json path

[solomonng2001]

• Remove criterias from sorting, such that sorting is now only left with the criterias name, birthdays and priority, and update sorting section in user guide.
• Update user guide images clients section, policy section and reminders section, as well as update command structure image such that parameters is changed to fields.
• Change remaining addressbook.json to clientcare.json.
• Closes #128.

[getsquared]

Relates to #176