docs: improve README.md and split architecture UML

[CasperGamingOne]

Summary by Jules

Rewrote the README.md to be more detailed, structured, and visually appealing, and split the single UML diagram into three distinct diagrams based on architectural layers.

New Features:

• Added Core_Diagram.svg, Services_Diagram.svg, and UI_Diagram.svg to visualize the architecture more cleanly.

Enhancements:

• Re-structured README.md with emojis, badges, and significantly more detail about the Core, Services, and UI layers.
• Added a standard link to the repository's latest release in the Installation instructions.

Refactoring:

• Removed the monolithic Architecture_Diagram.svg in favor of the layered approach.

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PR created automatically by Jules for task 1314763483314900388 started by @CasperGamingOne

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[github-actions]

Qodana Community for .NET

113 new problems were found

Inspection name	Severity	Problems
Method return value is never used: Private accessibility	🔶 Warning	1
Unused local variable	🔶 Warning	1
Type member is never used: Non-private accessibility	◽️ Notice	66
Member can be made private: Non-private accessibility	◽️ Notice	17
Auto-property can be made get-only: Non-private accessibility	◽️ Notice	9
Property can be made init-only: Non-private accessibility	◽️ Notice	7
Type member is never accessed via base type: Non-private accessibility	◽️ Notice	5
Merge null/pattern checks into complex pattern	◽️ Notice	2
Unused parameter: Non-private accessibility	◽️ Notice	2
'if' statement can be rewritten as '?:' expression	◽️ Notice	1
Replace with 'field' keyword	◽️ Notice	1
Simplify LINQ expression (use 'All')	◽️ Notice	1

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