Remove `lsof` dependency in replit deploy (#569)

Use `killall -q python3` instead

.replit

@@ -1,3 +1,3 @@
 language = "bash"
-run = "kill $(lsof -t -i:5000) > /dev/null 2>&1; pip install -r requirements.txt && ./run"
-onBoot = "kill $(lsof -t -i:5000) > /dev/null 2>&1; pip install -r requirements.txt && ./run"
+run = "killall -q python3 > /dev/null 2>&1; pip install -r requirements.txt && ./run"
+onBoot = "killall -q python3 > /dev/null 2>&1; pip install -r requirements.txt && ./run"