Add OpenGraph and SEO tags

inc/meta.php

@@ -1,5 +1,11 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <link rel="stylesheet" href="assets/css/main.css">
-<link rel="icon" href="assets/favicon.png" sizes="32x32" type="image/png">
 <link rel="icon" href="assets/favicon.svg" sizes="any" type="image/svg+xml">
+<link rel="icon" href="assets/favicon.png" sizes="32x32" type="image/png">
+<meta name="description" content="<?php echo SITE_DESCRIPTION; ?>" />
+<meta property="og:title" content="Don't Sell.Me" />
+<meta property="og:type" content="website" />
+<meta property="og:image" content="assets/logo.png" />
+<meta property="og:url" content="https://dontsell.me/site/" />
+<meta property="og:description" content="<?php echo SITE_DESCRIPTION; ?>" />

settings.template.php

@@ -1,6 +1,8 @@
 <?php
 
 define("SITE_TITLE", "Don't Sell.Me");
+define("SITE_DESCRIPTION", "Cloud apps that respect your privacy: file sharing, online office, live collaboration, video chat, and more");
+
 define("STRIPE_PK", "pk_live_xxxxx");
 define("STRIPE_SK", "sk_live_xxxxx");
 define("NEXTCLOUD_USER", "admin");