Refactored Chatbot icon; Fixed nested URLs 404 page bug

[vansh-codes]

Description

TASKS DONE:

• changed the chatbot svg to new icon and added floating animation to make it more alive as suggested by Mastan Sayyed
• In the 404 not found page for nested invalid urls, the mini game was not working, fixed that error
• changed the favicon linking to the image from assets folder and made the path absolute path

Fixes # (issue)

Type of change

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

Checklist:

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

[github-actions[bot]]

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[vansh-codes]

@sanjay-kv please review!