Fix order of Codechef and GH solution icon in SEPT.md

[aashutoshrathi]

• [x] This issue is for enhancement.
• [ ] I will send my PR only after I'm assigned to this issue by any maintainer.
• [ ] I ensure that I'm not assigned to more than 2 issues.
  • [ ] Assign this issue to me (I want to work on this).

It's not necessary for all for points to be checked, we will look at what is required once you open an issue.

[vijaygomathinayagam]

I will take this