Our courses section attractively rebuilt #589 (video attached)

[harshita-2003]

Description

DONE : I have built the ui the structure for the popular courses section with just temporary images and text

Fixes #589

Screenshots

https://github.com/aniketsinha2002/DataScienceWebsite.github.io/assets/119532943/88f40550-9832-4727-80d7-132a0dfb83b6

Checklist

• [ x] Tests have been added or updated to cover the changes
• [ x] Documentation has been updated to reflect the changes
• [ x] Code follows the established coding style guidelines
• [ x] All tests are passing

[aniketsinha2002]

@harshita-2003 Don't make changes to the theme and the UI design. You can implement new things or make the old ones better.