MAPG-82 introduce very basic templating

views/templates/main_header.php

@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>MapGuesser</title>
+    <link href="static/css/mapguesser.css" rel="stylesheet">
+    <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;500&family=Roboto+Mono:wght@300;500&display=swap" rel="stylesheet">
+    <link rel="icon" type="image/png" sizes="192x192" href="static/img/favicon/192x192.png">
+    <link rel="icon" type="image/png" sizes="96x96" href="static/img/favicon/96x96.png">
+    <link rel="icon" type="image/png" sizes="32x32" href="static/img/favicon/32x32.png">
+    <link rel="icon" type="image/png" sizes="16x16" href="static/img/favicon/16x16.png">
+</head>
+<body>
+    <div id="loading">
+        <img src="static/img/loading.svg">
+    </div>