Melt butter in a 12-inch saute pan over medium-low heat. Increase the heat slightly and add the onion, celery, and 1/2 teaspoon kosher salt, and sweat for 5 to 7 minutes. Add garlic and cook for an additional 1 to 2 minutes. Reduce the heat to low and add the artichoke hearts, bread crumbs, lemon zest, remaining 1/2 teaspoon kosher salt, pepper, and oregano. Continue cooking for 2 to 3 more minutes. Remove from the heat and set aside.