Add GDPR-compliant cookie header & privacy-policy

_includes/head/custom.html

@@ -16,4 +16,26 @@
 <meta name="msapplication-TileImage" content="{{ base_path }}/images/mstile-144x144.png?v=PYEmwKvQAx">
 <meta name="msapplication-config" content="{{ base_path }}/images/browserconfig.xml?v=PYEmwKvQAx">
 <meta name="theme-color" content="#2E3440">
+
+<link rel="stylesheet" type="text/css" href="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.css" />
+<script src="//cdnjs.cloudflare.com/ajax/libs/cookieconsent2/3.1.0/cookieconsent.min.js"></script>
+<script>
+window.addEventListener("load", function(){
+window.cookieconsent.initialise({
+  "palette": {
+    "popup": {
+      "background": "#2e3440"
+    },
+    "button": {
+      "background": "#60818f"
+    }
+  },
+  "theme": "edgeless",
+  "position": "top",
+  "static": true,
+  "content": {
+    "message": "This website uses cookies to display the current guide progress on the sidebar."
+  }
+})});
+</script>
 <!-- end custom head snippets -->