Added dark mode in all webpages

[shreyanukala]

Issue solved

#60
Closes: # (issue number)

Changes Proposed

Brief description of what is fixed/changed

Types of changes made:

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (Documentation content changed)
• Other (please describe):

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
• My changes does not break the current system and it passes all the current test cases.

Screenshots

Please attach the screenshots of the changes made in case of change in user interface

Other information

Any other information that is important to this pull request

[github-actions]

@shreyanukala Thank you for Opening pull request. We will get back to you as soon as possible. Your patience is greatly appreciated! Thanks! 🥳.
PS: Please double check that you linked the corresponding issue.