fix: theme toggle on membership page

[RinkiJhunjhunwala]

Title and Issue number

Title : Fixed theme toggle button on membership page

Issue No. : #1890

Code Stack :
HTML, CSS
Close # 1890

Description

The theme toggle button on membership page was just a checkbox, I have fixed it to moon and sun toggle signs.

Video/Screenshots (mandatory)

Type of PR

• [ X] Bug fix
• Feature enhancement
• Documentation update
• Other (specify): _______________

Checklist:

• [X ] I have performed a self-review of my code.
• [ X] I have commented my code, particularly in hard-to-understand areas.
• [X ] I have tested the changes thoroughly before submitting this pull request.
• [X ] I have provided relevant issue numbers, screenshots, and videos after making the changes.
• [ X] I have gone through the contributing.md file before contributing
• [X ] I have Starred the Repository.

Additional context:

##Are you contributing under any Open-source programme?

Social Winter of Code (SWOC)
Please merge this issue under SWOC.

• I am contributing under KWOC 2025

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