add:not found page

handlers/error.go

@@ -0,0 +1,13 @@
+package handlers
+
+import (
+	"net/http"
+	"personal-site/pages"
+
+	"github.com/gin-gonic/gin"
+)
+
+func NotFoundHandler(c *gin.Context) {
+    c.Status(http.StatusNotFound)
+    pages.ErrorPage().Render(c.Request.Context(), c.Writer)
+}