feat: add email sharing functionality, canonical URLs, and enhance metadata for SEO

manifest.webmanifest

@@ -0,0 +1,18 @@
+{
+  "name": "Blog",
+  "short_name": "Blog",
+  "description": "A Bludit blog using the Blowdit theme.",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#171717",
+  "theme_color": "#1f1f1f",
+  "icons": [
+    {
+      "src": "img/favicon.png",
+      "sizes": "any",
+      "type": "image/png",
+      "purpose": "any"
+    }
+  ]
+}