Bringing the night mode button at proper position in courses page.

[Siddhesh777]

Description

The Night Mode button inside the Courses page is not at the right position.
I will bring it at the top right corner of the page.

I am contributor at GSSOC'22.
Please assign this issue to me.

Screenshots

[The-Shivam-garg]

Hey @Siddhesh777 ,I have assign you this issue but look @Siddhesh777 i want you to fix the few more bugs in it :
1.Changing the text size of the description.
2.Changing the position of the toggle.

[Siddhesh777]

hey @The-Shivam-garg
Please review this PR