The Scimitars were at an angle to get the right lift for the takeoff from the catapult. The strop has the plane under tension just before the launch. The tension lifts the front off the deck and the plane is supported by a wheel at the back of the plane. You can just make out the wheel and the strop (roughly halfway down the fuselage) in the photo.
We had a similar problem with the Phantom but being a much heavier plane and the design changes that would have been needed, RN Phantoms had an extending front undercarriage. On the catapult, this was extended lifting the nose of the Phantom higher of the deck, achieving the same result.
Scimitars were dreadful planes to land. It was always said that no one landed a Scimitar, they did a controlled crash landing, even on land.