Update DG and UG - UI component and Find feature

[mhdsyfq77]

Changes to DG:

• Changed UI class diagram and replaced png image
• Updated UI links and descriptions
• Created Find command sequence diagram
• Add find sequence diagram image
• List out find command behaviour during execution

Changes to UG:

• Include Find feature
• Removed Save feature
• A small nitpick i.e. {module description} ➡️ {module code}

Resolves #60 and resolves #61

[codecov-io]

Codecov Report

Merging #62 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #62   +/-   ##
=========================================
  Coverage     73.31%   73.31%           
  Complexity      424      424           
=========================================
  Files            76       76           
  Lines          1274     1274           
  Branches        123      123           
=========================================
  Hits            934      934           
  Misses          302      302           
  Partials         38       38           

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[Silvernitro]

LGTM! Just one small comment/question