Moved css, js files from includes to assets.

assets/css/light.css

@@ -0,0 +1,67 @@
+/* Light mode */
+@media (prefers-color-scheme:light) {
+  body {
+    background-color: #AAAAAA;
+    color: black;
+  }
+
+  h1, h2, h3 {
+    color: black;
+  }
+
+  header {
+    background-color: white;
+  }
+
+  main {
+    color: black;
+  }
+
+  .menu {
+    color: black;
+  }
+
+  .menu * {
+    color: black;
+  }
+
+  li a {
+    color: black;
+  }
+
+  li a:hover {
+    color: #CC99FF;
+    text-decoration: underline;
+  }
+
+  li a:visited {
+
+    /*color: blue;*/
+  }
+
+  .content {
+    background-color: white;
+  }
+
+  main p {
+    color: black;
+  }
+
+  main a, footer a {
+    color: black;
+  }
+
+  main a:hover, footer a:hover {
+    color: black;
+  }
+
+  section {
+    background-color: white;
+  }
+
+  footer {
+    background-color: white;
+    color: black;
+  }
+
+}