Update Documentations

[cmHuang777]

• Fix minor issues in DG and UG
• fixes Appointments remain in the address book even after the patient/doctor is deleted #216
• Deleted PersonCard and PersonListPanel which are dead code

Updated DG:

• Added squence and activity diagram for AddAppointment
• fixes Add new Section Effort in the DG #241
• fixes Add new Section Planned Enhanced in the DG #240

[kohkaijie]

LGTM!

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (8167aec) 79.72% compared to head (43d86cc) 80.54%.

Files	Patch %	Lines
...u/address/logic/parser/AddDoctorCommandParser.java	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #249      +/-   ##
============================================
+ Coverage     79.72%   80.54%   +0.82%     
  Complexity      781      781              
============================================
  Files           110      108       -2     
  Lines          2500     2473      -27     
  Branches        266      265       -1     
============================================
- Hits           1993     1992       -1     
+ Misses          419      393      -26     
  Partials         88       88              

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[chonguschonguschongus]

LGTM!