update repository references and improve script handling

proxy/rootfs/etc/cont-init.d/nginx.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/with-contenv bashio
+# ==============================================================================
+# Configures NGINX for use with this add-on.
+# ==============================================================================
+declare server
+
+bashio::var.json \
+    entry "$(bashio::addon.ingress_entry)" \
+    | tempio \
+        -template /etc/nginx/templates/ingress.gtpl \
+        -out /etc/nginx/servers/ingress.conf
+
+server=$(bashio::config 'server')
+
+echo '{"server":"'"$server"'"}' \
+    | tempio \
+        -template /etc/nginx/templates/upstream.gtpl \
+        -out /etc/nginx/includes/upstream.conf