added HeadContent property to Site and replaced Meta property on Page with HeadContent property.

Oqtane.Shared/Models/Site.cs

@@ -79,7 +79,7 @@ namespace Oqtane.Models
         public string RenderMode { get; set; }
 
         /// <summary>
-        /// Keeps track of site configuration changes and is used by the IUpgradeable interface
+        /// Keeps track of site configuration changes and is used by the ISiteMigration interface
         /// </summary>
         public string Version { get; set; }
 
@@ -88,6 +88,11 @@ namespace Oqtane.Models
         /// </summary>
         public int? HomePageId { get; set; }
 
+        /// <summary>
+        /// Content to be included in the head of the page
+        /// </summary>
+        public string HeadContent { get; set; }
+
         [NotMapped]
         public Dictionary<string, string> Settings { get; set; }