Chore: Codebase cleanup — remove deprecated assets and update libraries

[Ubayed-Bin-Sufian]

Current Behavior

The codebase currently contains deprecated files and libraries. Some libraries are outdated and may cause compatibility issues or security vulnerabilities. These unnecessary files and outdated dependencies increase the maintenance burden and potential technical debt.

Desired Situation

Remove all deprecated files and unused libraries from the repository. Update existing libraries to their latest stable versions, ensuring compatibility with the current codebase. Verify that the application functions correctly after the updates and clean-up.

THE ISSUE IS STILL BEING WRITTEN. SUB-ISSUES, REQUIREMENTS FOR PRS WILL BE ADDED SOON.

Task List

• Remove cache.appcache #4665
• Remove sugar-web library #4680
• Remove legacy icons #4681
• Upgrade jQuery from version 2.1.4 to 3.7.1 #4682

Checklist

• I have read and followed the project's code of conduct.
• I have searched for similar issues before creating this one.
• I have provided all the necessary information to understand and reproduce the issue.
• I am willing to contribute to the resolution of this issue.

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[sujaltangde]

#Opened a PR to resolve this: #4677.
Kindly review it when convenient!

[asmit990]

did the PR (#4689)
did this all