Update DG User Story, About Us Gambe page, User Guide User section, Raeadme image

[juliusgambe]

• Add the following user stories to the user guide:

1. As an owner, I can create a local account so that I can personalise and secure my account.
2. As a registered owner, I can log in to my local account so that I can access my data.
3. As a forgetful owner, I can retrieve my account so that I can still recover my data.
4. As a logged-in owner, I can log out of my account so that I can keep my data secure.
5. As a registered owner, I can update my password so that I can constantly keep my data secure.
6. As a registered owner, I can delete my account so that I can have greater control over my data and account removal for privacy reasons.

• Add all user stories including optional user stories to the documentation guide.
• Add About Us gambe page and picture
• Add PPP julius gambe page

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (c954c36) 75.26% compared to head (692fd6c) 75.26%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #68   +/-   ##
=========================================
  Coverage     75.26%   75.26%           
  Complexity      419      419           
=========================================
  Files            71       71           
  Lines          1338     1338           
  Branches        126      126           
=========================================
  Hits           1007     1007           
  Misses          301      301           
  Partials         30       30           

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[B-enguin]

LGTM