If the forks are really bad, you can sometimes see creases where the metal has folded. Bent forks can also be extremely subtle. To check them you need to take them apart and roll them on a flat, clean surface. Any bend will be apparent by a change in the profile between the fork stanchion and surface. This is really the DIY at home method of checking them. Professionals have very delicate and precise instruments for measuring forks.
It's possible to have forks straightened, although it can only be done with very subtle bends, and the cost for doing so is usually about the same as buying a good used set. There is also a risk that the strength of the forks have been compromised while being bent back and forth.
As mentioned in some other answers, I would start with trying to loosen the bolts around the triple tree and wheel and let everything realign. https://www.youtube.com/watch?v=IFV7ZJrORWw
It's also possible this is a problem with the headstock, or some other part of the frame.