Added Shortcut feature to toggle theme

[vansh-codes]

Description

TASKS DONE:

• Added Ctrl + Q shortcut to toggle easily between themes along with a tooltip to let users know about the shortcut

Fixes # (issue)

Type of change

• Added a new machine learning frameworks, libraries or software.
• Documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

[github-actions]

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