message: docs: update Angular Global Summit on event pages
  After my speaker meeting with the Geekle team, they communicated that
  they moved the date to avoid colliding with ng-conf. Originally added
  in#40697, per
  PR Close
diff: [
  + {
  + "name": "Angular Global Summit",
  + "location": "Online",
  + "linkUrl": "https://link.geekle.us/angular/offsite",
  + "date": {
  + "start": "2021-06-01",
  + "end": "2021-06-02"
  + }
  + },
  {
  "name": "ng-conf",
  "location": "Online",
  "end": "2021-04-15"
  }
  },
  - {
  - "name": "Angular Global Summit",
  - "location": "Online",
  - "linkUrl": "https://angular.geekle.us/",
  - "date": {
  - "start": "2021-04-13",
  - "end": "2021-04-14"
  - }
  - },
  {
  "name": "ng-china",
  "location": "Online",
  