Added licensing, redirected null /go requests to homepage, corrected 404 errors.

LICENSE

@@ -0,0 +1,32 @@
+OpenShorte - An open source URL shortener
+Copyright © 2019 - Bryan Pedini
+
+This program is licensed per section,
+please read carefully every LICENSE file provided
+to fully understand what you can do and what not.
+
+
+errors/* - js/* - functions.php - index.php:
+Copyright © 2019 - Bryan Pedini
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+
+config.php:
+It's a stupid config file, do you really think I want to
+beat my head to decide what license is it under or to
+create one? Use it to do whatever you want, it may break
+the website or it may not, it's up to you and the fact that
+it is provided empty.
+Only a suggestion: if you don't populate the config file,
+what part of the website you think that will work properly?