reorganize app files

app/routes/instance.go

@@ -0,0 +1,20 @@
+package routes
+
+import (
+	"net/http"
+	"proxmoxaas-dashboard/app/common"
+
+	"github.com/gin-gonic/gin"
+)
+
+func HandleGETInstance(c *gin.Context) {
+	_, _, _, err := common.GetAuth(c)
+	if err == nil {
+		c.HTML(http.StatusOK, "html/instance.html", gin.H{
+			"global": common.Global,
+			"page":   "instance",
+		})
+	} else {
+		c.Redirect(http.StatusFound, "/login.html")
+	}
+}