Remove the remove button the edit question page

[nihal467]

Describe the bug

When a user accidently click on the remove button, there is no way to add them back

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

We should hide the remove button for structure question edit page (@amjithtitus09 can you take a confirmation from @gigincg or @bodhish before executing it)

Screenshots

[Sourav6971]

hey @nihal467 I have removed the "remove" button. Is anything else required. Can I create a PR?