feat: allow ad-hoc creation of new teams (#3964)

Co-authored-by: Tom Moor <tom@getoutline.com>

app/stores/AuthStore.ts

@@ -263,6 +263,20 @@ export default class AuthStore {
     }
   };
 
+  @action
+  createTeam = async (params: { name: string }) => {
+    this.isSaving = true;
+
+    try {
+      const res = await client.post(`/teams.create`, params);
+      invariant(res?.success, "Unable to create team");
+
+      window.location.href = res.data.transferUrl;
+    } finally {
+      this.isSaving = false;
+    }
+  };
+
   @action
   logout = async (savePath = false) => {
     // if this logout was forced from an authenticated route then