feat: Re-enable signup and login

src/mixins.ts

@@ -3,17 +3,22 @@ import Vue from "vue";
 
 @Component
 export class NotifyMixin extends Vue {
-  showError(): void {
-    this.$buefy.toast.open({
-      message: "Es ist leider ein Fehler aufgetreten.",
-      type: "is-danger",
-    });
+  public showError(): void {
+    this.showMessage("Es ist leider ein Fehler aufgetreten.", "is-danger");
   }
 
   showSuccess(message: string): void {
-    this.$buefy.toast.open({
-      message,
-      type: "is-success",
-    });
+    this.showMessage(message, "is-success");
+  }
+
+  showWarning(message: string): void {
+    this.showMessage(message, "is-warning");
+  }
+
+  private showMessage(
+    message: string,
+    type: "is-success" | "is-danger" | "is-warning"
+  ): void {
+    this.$buefy.toast.open({ message, type });
   }
 }