Reduce the number of commits the extension produces

[NamesMark]

Currently, the extension produces 3 commits per submission of a solution for a new problem:

1. Create README page for the problem
2. Update README - Topic Tags
3. Update the problem code

, and 2 commits per re-submission:

1. Update README - Topic Tags (with diff of 0)
2. Update the problem code

I would like to propose:

1. Don't do "Update README - Topic Tags" when diff is 0 (when it's a re-submission).
2. Ideally, it would be best if we had only 1 commit per problem, that updates all necessary files at once.

While some may see it as a plus for their GitHub profile, it's still a lot of empty commits.