Add title to page so that it's easier to search in history

[Siddhartha Varma]

Closed a few katbin tabs accidentally, had to re-open each to check the correct snippet I needed from the paste

Instead of title being katbin for pastes, it should be katbin - {paste id} so that it's easier to search in browser history

(sort of remembered the paste id, but not entirely, so could not open directly)