Use same port for Hugo and Docker, allow override via $PORT

run-dev-server.sh

@@ -1,3 +1,8 @@
-#/bin/sh
-# Runs Hugo server, accessible at http://localhost (port 80)
-docker run -p 127.0.0.1:80:1313 -u $(id -u):$(id -g) -v ${PWD}:/src hugomods/hugo:exts hugo server --bind 0.0.0.0
+#!/bin/sh
+
+if [ -z "$PORT" ]; then
+    PORT=80
+fi
+
+# Runs Hugo server, accessible at http://localhost:$PORT (default to port 80)
+docker run -p 127.0.0.1:${PORT}:${PORT} -u $(id -u):$(id -g) -v ${PWD}:/src hugomods/hugo:exts hugo server --bind 0.0.0.0 --port ${PORT}