Meta tags (#35)

* add seo meta tags

Author: josuebran

src/img/datastax-docs-banner.png

@@ -1 +1,110 @@
     {{!-- Add additional meta tags here --}}
+
+    {{!-- apple touch icon --}}
+    {{!-- <link rel="apple-touch-icon" sizes="180x180" href="https://www.datastax.com/en/astra/_/img/apple-touch-icon-180x180.png"> --}}
+    <link rel="icon" href="https://www.datastax.com/favicon.ico">
+    <meta property="article:published_time" content="{{page.localdate}}">
+    <meta property="article:modified_time" content="{{page.docdate}}">
+    <meta property="article:author" content="DataStax">
+    {{!-- og --}}
+    <meta property="og:site_name" content="DataStax Documentation">
+    <meta property="og:type" content="article">
+    <meta property="og:url" content="{{page.canonicalUrl}}">
+    <meta property="og:title" content="{{page.title}} :: {{site.title}}">
+    <meta property="og:description" content="{{page.description}}">
+    <meta property="og:image" content="https://docs.datastax.com/en/astra/_/img/datastax-docs-banner.png">
+    <meta property="og:image:type" content="image/png">
+    <meta property="og:image:width" content="1200">
+    <meta property="og:image:height" content="628">
+    <meta property="og:image:alt" content="DataStax Documentation">
+    {{!-- twitter --}}
+    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:site" content="@datastax">
+    <meta name="twitter:creator" content="@datastax">
+    <meta name="twitter:url" content="{{page.canonicalUrl}}">
+    <meta name="twitter:title" content="{{page.title}} :: {{site.title}}">
+    <meta name="twitter:description" content="{{page.description}}">
+    <meta name="twitter:image" content="https://docs.datastax.com/en/astra/_/img/datastax-docs-banner.png">
+    <script type="application/ld+json">
+    [
+    {{!-- {{commented expressions}} --}}
+    {{#if (eq  "https://docs.datastax.com/en/astra/home/astra.html" page.canonicalUrl)}}
+    {
+        "@context": "https://schema.org",
+        "@type": "WebSite",
+        "@id": "https://docs.datastax.com",
+        "name": "DataStax Documentation",
+        "url": "{{page.canonicalUrl}}",
+        "image": "https://docs.datastax.com/en/astra/_/img/datastax-docs-banner.png",
+        "sameAs": [
+             "https://github.com/datastaxdevs/",
+             "https://twitter.com/datastaxdevs",
+             "https://datastax.medium.com/"
+         ],
+        "potentialAction": {
+            "@type": "SearchAction",
+            "target": "https://www.datastax.com/search?dataset=docs&query={search_term}",
+            "query-input": "required name=search_term"
+        },
+        "Publisher":{
+            "@type": "Corporation",
+            "@id": "https://datastax.com#organization",
+            "name": "DataStax",
+            "url": "https://datastax.com"
+        },
+        "Author":{
+            "@type": "Corporation",
+            "@id": "https://datastax.com#organization",
+            "name": "DataStax"
+        }
+    },
+    {{else}}
+    {
+        "@context": "https://schema.org",
+        "@type": "WebPage",
+        "@id": "{{page.canonicalUrl}}",
+        "name":"{{page.title}}",
+        "inLanguage":"en-US",
+        "reviewedBy":{
+            "@type": "Corporation",
+            "@id": "https://datastax.com#organization",
+            "name": "DataStax"
+        },
+        "author":{
+            "@type": "Corporation",
+            "@id": "https://datastax.com#organization",
+            "name": "DataStax"
+        },
+        "isPartOf": {
+            "@type": "WebSite",
+            "@id": "https://docs.datastax.com",
+            "name": "DataStax Documentation"
+        },
+        "mainEntity":
+        {
+            "@type":"TechArticle",
+            "@id": "{{page.canonicalUrl}}#main_content",
+            "mainEntityOfPage": "true",
+            "datePublished":"{{page.localdate}}",
+            "dateModified":"{{page.docdate}}",
+            "headline": "{{page.title}}",
+            "description":"{{page.description}}",
+            "keywords":"{{page.keywords}}",
+            "image": "https://docs.datastax.com/en/astra/_/img/datastax-docs-banner.png",
+            "publisher":{
+                "@type": "Corporation",
+                "@id": "https://datastax.com#organization",
+                "name": "DataStax",
+                "url": "https://datastax.com"
+            },
+            "author":{
+                "@type": "Corporation",
+                "@id": "https://datastax.com#organization",
+                "name": "DataStax",
+                "url": "https://datastax.com"
+            }
+        }
+     }
+    {{/if}}
+    ]
+    </script>