Changed searchbar to automatic search

- Searchbar now searches as you type
- There is a delay of 250 ms between the keyup event firing and the
search starting (so you don't spam the server or lag your computer when
typing)

- Also moved the addContent box into the content container, opinions?
- Also removed the jump to the top of the screen when filtering, now it
only jumps when you press the clear filters button or change content
page