Refactor authentication handlers and middleware

internal/auth/get.go

@@ -0,0 +1,17 @@
+package auth
+
+import (
+	"fmt"
+	"net/http"
+
+	_ "embed"
+)
+
+//go:embed  templates/login.html
+var loginHTML string
+
+func getLogin(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("content-type", "text/html")
+	fmt.Fprint(w, loginHTML)
+	return
+}