The father of murdered Israeli concert-goer, Shani Louk, appeared at a pro-Israel rally in Times Square Monday night where he said the enduring image of her lifeless body being paraded around by Hamas terrorists illustrates the “darkness” the Jewish state is fighting against. Nissim Louk told The Post that before and after photos taken of his 23-year-old German-Israeli daughter on Oct. 7 — which appeared in countless newspapers the next day — emphasize what’s at stake in the ongoing war between Israel and Hamas. One photo shows the young tattoo artist joyfully dancing at a music festival in Israel and...