Update UML diagrams to the new version of PlantUML

[Eclipse-Dominator]

Fixes #200

Alternative ver where the newer theme is used instead: #202

As of PlantUML 1.2023.2, there has been a change in behavior when rendering PlantUML diagrams. This causes some of the PlantUML diagrams to be rendered incorrectly or fail to compile. Some of the diagrams are also being rendered in a different theme due to a change in the default color theme.

Therefore some of the PlantUML code and images need to be updated to ensure functionality as well as consistency. The old color scheme also needs to be applied as some of the manual color changes are based on the older theme.

[canihasreview[bot]]

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[codecov[bot]]

Codecov Report

Merging #201 (0ab2649) into master (a976ec9) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #201   +/-   ##
=========================================
  Coverage     74.03%   74.03%           
  Complexity      423      423           
=========================================
  Files            71       71           
  Lines          1290     1290           
  Branches        127      127           
=========================================
  Hits            955      955           
  Misses          301      301           
  Partials         34       34           

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[canihasreview[bot]]

v1

@Eclipse-Dominator submitted v1 for review.

• [v1 1/2] Update UML diagrams to resolve rendering issues
• [v1 2/2] Remove unused PlantUML diagrams

(:books: Archive)

Checkout this PR version locally

```sh git fetch https://github.com/se-edu/addressbook-level3.git refs/pr/201/1/head:BRANCHNAME ``` where `BRANCHNAME` is the name of the local branch you wish to fetch this PR to.

[damithc]

Closing in favor of #202