Refactored the website

Renamed "includes" to "templates"
Added .htaccess to redirect requests to index.php
Added function to split request URL into array
Corrected locations in scripts and pages

templates/insert.php

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+<!DOCTYPE html>
+<html>
+    <head>
+        <title>BJPHoster URL Shortener | Control Panel</title>
+    </head>
+    <body>
+        <button onclick="logout()">Logout</button>
+        <div id="urllist">
+<?php
+                if ( ! $row ) {
+                    echo ( "You have not created any URL yet.<br>" );
+                }
+                else {
+                    do {
+                        echo ( "\t\t\t" . '<div>' . $row [ 'ID' ] . " | " . $row [ 'URL' ] . "</div>\n" );
+                    } while ( $row = $result->fetch_assoc ( ) );
+                }
+?>
+        </div>
+        <input type="text" id="form-url" placeholder="URL:">
+        <button onclick="urlinsert()">Insert new URL</button><br>
+        <div id="responsetext"></div>
+        <script src="js/insertnew.js"></script>
+        <script>var script_name = "<?=substr($_SERVER['SCRIPT_NAME'],0,-10)?>";</script>
+    </body>
+</html>

templates/login.php

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+<!DOCTYPE html>
+<html>
+    <head>
+        <title>BJPHoster URL Shortener | Login</title>
+    </head>
+    <body>
+        <input type="text" id="form-username"><br>
+        <input type="password" id="form-password"><br>
+        <button onclick="login()">Login</button><br>
+        <div id="responsetext"></div>
+        <script src="js/sha512.min.js"></script>
+        <script src="js/login.js"></script>
+        <script>var script_name = "<?=substr($_SERVER['SCRIPT_NAME'],0,-10)?>";</script>
+    </body>
+</html>

templates/redirect.html

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+<!DOCTYPE html>
+<html>
+    <head>
+        <title id="title">Redirect in 5 seconds</title>
+    </head>
+    <body>
+        <center>
+            <h1>You will be redirected to <span id="redirect-url"></span> in <span id="body-timeout">5</span></h1>
+        </center>
+        <script>
+            window.onload = function() {
+                var seconds = 5;
+                document.getElementById("redirect-url").innerHTML = my_location;
+                function update_timeout (interval) {
+                    document.getElementById("title").innerHTML = "Redirect in "+seconds+" seconds";
+                    document.getElementById("body-timeout").innerHTML = seconds;
+                    if (seconds == 0) {
+                        window.location.href = my_location;
+                        clearInterval (interval);
+                    }
+                }
+                interval = setInterval (function() {update_timeout(interval); seconds = seconds - 1;}, 1000);
+            }
+        </script>
+    </body>
+</html>