Convert material-color CSS to submodule

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "static/css/material-color"]
+	path = static/css/material-color
+	url = https://source.netsyms.com/Netsyms/Material-Color

app.php

@@ -30,7 +30,7 @@ if (!is_empty($_GET['page'])) {
 
         <link href="static/css/bootstrap.min.css" rel="stylesheet">
         <link href="static/css/font-awesome.min.css" rel="stylesheet">
-        <link href="static/css/material-color.min.css" rel="stylesheet">
+        <link href="static/css/material-color/material-color.min.css" rel="stylesheet">
         <link href="static/css/app.css" rel="stylesheet">
         <?php
         // custom page styles

index.php

@@ -84,7 +84,7 @@ if (checkLoginServer()) {
 
         <link href="static/css/bootstrap.min.css" rel="stylesheet">
         <link href="static/css/font-awesome.min.css" rel="stylesheet">
-        <link href="static/css/material-color.min.css" rel="stylesheet">
+        <link href="static/css/material-color/material-color.min.css" rel="stylesheet">
         <link href="static/css/app.css" rel="stylesheet">
         <?php if (RECAPTCHA_ENABLED) { ?>
             <script src='https://www.google.com/recaptcha/api.js'></script>

static/css/material-color

@@ -0,0 +1 @@
+Subproject commit 639192478e91666490ca7728c5e335dc06f0c111