Update dg for v1.2b

[Jayne1010]

Closes #40

• Does not cover everything e.g. the diagram
• Only edited the delete command to delete by unique IC number

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.02%. Comparing base (bed5d5d) to head (c542565).

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #67   +/-   ##
=========================================
  Coverage     72.02%   72.02%           
  Complexity      474      474           
=========================================
  Files            78       78           
  Lines          1562     1562           
  Branches        155      155           
=========================================
  Hits           1125     1125           
  Misses          394      394           
  Partials         43       43           

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[jiahui0309]

LGTM! We can continue updating other sections in dg in subsequent milestones 👍🏼