Don't automatically save generated file to clipboard

[joker314]

This pull request makes two three changes:

• Don't copy security.txt files to the clipboard, instead output them to a visible read-only textbox with a button that allows copying to the clipboard
• Once the form is submitted, scroll that textbox into view
• Make all the tabs consistent (four, not two, since I think it was originally four - spaces)

I looked at the level of support for scrollIntoView. Most browsers support it when the first argument is a Boolean. However, I'm passing an object so that the scrolling is smooth. I think it is very likely (but am not certain) that these older browsers will still scroll the element into view, even if they don't scroll smoothly.

I haven't added anything to handle browsers which don't support scrollIntoView. Should I? (I'd be happy to do so) 8eb8d28 will use the hash component of URLs to scroll to the relevant location as a fallback.

[joker314]

Alright, I've added changes in 8eb8d28 which should keep the website compatible with very old browsers.

[EdOverflow]

Thank you, @joker314.