Improve SEO in nginx.conf, index.html; update favicon and logos; embedded card now supported; Dockerfile slimmed and modernized

public/index.html

@@ -4,13 +4,31 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="theme-color" content="#000000" />
-    <meta
-      name="description"
-      content="Tymur Arsentiev's portfolio and blog site"
-    />
+
+    <!-- Core SEO -->
+    <title>Tymur Arsentiev - Blog & Portfolio</title>
+    <meta name="description" content="Tymur Arsentiev's portfolio and blog site" />
+    <meta name="author" content="Tymur Arsentiev" />
+    <link rel="canonical" href="https://tymur999.com/" />
+
+    <!-- Open Graph / Social Sharing (Facebook, LinkedIn, Discord, etc.) -->
+    <meta property="og:type" content="website" />
+    <meta property="og:url" content="https://tymur999.com/" />
+    <meta property="og:title" content="Tymur Arsentiev - Portfolio & Blog" />
+    <meta property="og:description" content="Tymur Arsentiev's portfolio and blog site" />
+    <meta property="og:image" content="https://tymur999.com/logo192.png" />
+
+    <!-- Twitter Cards -->
+    <meta name="twitter:card" content="summary_large_image" />
+    <meta name="twitter:url" content="https://tymur999.com/" />
+    <meta name="twitter:title" content="Tymur Arsentiev - Portfolio & Blog" />
+    <meta name="twitter:description" content="Tymur Arsentiev's portfolio and blog site" />
+    <meta name="twitter:image" content="https://tymur999.com/logo192.png" />
+
+    <!-- Existing App Manifest & Icons -->
+    <link rel="icon" href="/logo512.png" />
     <link rel="apple-touch-icon" href="/logo192.png" />
     <link rel="manifest" href="/manifest.json" />
-    <title>tymur999.com</title>
   </head>
   <body>
     <noscript>You need to enable JavaScript to run this app.</noscript>