Redesign UI and add first-party Docker runtime support

docker/entrypoint.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -eu
+
+CONFIG_DIR="${XTEVE_CONFIG:-/xteve/config}"
+PORT="${XTEVE_PORT:-34400}"
+
+mkdir -p "${CONFIG_DIR}"
+
+exec /usr/local/bin/xteve -config "${CONFIG_DIR}" -port "${PORT}" "$@"