chore: add updated meta to pages

site3/layouts/_default/baseof.html

@@ -20,6 +20,7 @@
     <meta property="og:type" content="website">
     <meta property="og:url" content="{{.Permalink}}">
     <meta property="og:site_name" content="go-semrel-gitlab">
+    <meta property="og:updated_time" content="{{now}}">
     <meta name="twitter:card" content="summary">
     <meta name="twitter:creator" content="@juranki">
     <meta name="keywords" content="semantic versioning,semver,semantic release,git,gitlab,automation,tag,commit,release note,changelog,change log,release,go-semrel-release">