added scroll animation

[PranavChauhan22]

Related Issue

Improving the home page

Closes: #187

Describe the changes you've made

Added scroll animations in various elements of home page

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.

[khannakshat7]

@PranavChauhan22 Can u increase the speed of animation and also add animations to cards as well

[PranavChauhan22]

Ok