Finalise DevOps.md

[yytan25]

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[codecov]

Codecov Report

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

Comparison is base (2ec82ce) 77.93% compared to head (acadd1d) 77.93%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/main/java/seedu/address/MainApp.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #253   +/-   ##
=========================================
  Coverage     77.93%   77.93%           
  Complexity      670      670           
=========================================
  Files           101      101           
  Lines          2103     2103           
  Branches        229      229           
=========================================
  Hits           1639     1639           
  Misses          393      393           
  Partials         71       71           

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