Add opengraph+twitter tags (#48)

exampleSite/content/posts/lorem-ipsum.md

@@ -3,6 +3,7 @@ title: "Lorem Ipsum"
 date: 2021-04-15T23:39:49+05:30
 tags: ["xyz", "def"]
 type: "post"
+image: "/images/lorem-ipsum/quick-fox.png"
 ---
 
 # Heading 1

themes/gokarna/layouts/partials/head.html

@@ -8,9 +8,26 @@
         }
     </style>
 
+    {{ $title := .Title | default .Site.Title }}
+    {{ $description := .Description | default .Site.Params.Description }}
+    {{ $image := .Params.image | default .Site.Params.AvatarURL }}
+
     <!-- SEO titles & descriptions -->
-    <title>{{ .Title | default .Site.Title }}</title>
+    <title>{{ $title }}</title>
-    <meta name="description" content="{{ .Description | default .Site.Params.Description }}">
+    <meta name="description" content="{{ $description }}">
+
+    <meta property="og:url" content="{{ .Permalink }}">
+    <meta property="og:type" content="website">
+    <meta property="og:title" content="{{ $title }}">
+    <meta property="og:description" content="{{ $description }}">
+    <meta property="og:image" content="{{ $image }}">
+
+    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:title" content="{{ $title }}">
+    <meta name="twitter:description" content="{{ $description }}">
+    <meta property="twitter:domain" content="{{ .Permalink }}">
+    <meta property="twitter:url" content="{{ .Permalink }}">
+    <meta name="twitter:image" content="{{ $image }}">
 
     <!-- SEO canonicals: helps Google understand your site better when using marketing campaign tagging etc -->
     <link rel="canonical" href="{{ .Permalink }}" />