implement partial SSR of instances

configs/.htmlvalidate.json

@@ -4,5 +4,13 @@
 	],
 	"rules": {
 		"no-inline-style": "off"
-	}
+	},
+	"elements": [
+		"html5",
+		{
+			"head": {
+				"requiredContent": []
+			}
+		}
+	]
 }

configs/template.config.json

@@ -1,6 +1,7 @@
 {
 	"listenPort": 8080,
 	"organization": "myorg",
+	"dashurl": "https://paas.mydomain.example",
 	"apiurl": "https://paas.mydomain.example/api",
 	"pveurl": "https://pve.mydomain.example"
 }