Redesigned and Improved 404 page UI

[rsinghcodes]

Explanation

Redesigned and Improved 404 page UI

Type of Change:

• User Interface

Checklist

• The PR fixes the issue that title starts with UI of 404 page should be improved #75.
• The PR explanation includes the words "Fixes #bugnum: ..." ( or "Fixes part of #bugnum" if the PR only partially fixes an issue ).
• The PR does not contain any unnecessary auto-generated code from Android Studio.
• The PR does not break any part of the existing code.
• The PR creator have carefully read & adhere to the contributing guidelines of the project.
• The PR is raised for an issue that has been assigned to you.
• The PR is made to the branch that's called "develop".
• The PR is raised from a branch that is up-to-date with "develop".

Please review and merge this issue under GSSOC '22.

Thanks!