remove provider setting from collab extension

docs/src/demos/Examples/CollaborativeEditing/index.vue

@@ -136,7 +136,6 @@ export default {
       extensions: [
         ...defaultExtensions(),
         Collaboration.configure({
-          provider: this.provider,
           type: this.type,
         }),
         CollaborationCursor.configure({

packages/extension-collaboration/src/index.ts

@@ -4,13 +4,11 @@ import {
 } from 'y-prosemirror'
 
 export interface CollaborationOptions {
-  provider: any,
   type: any,
 }
 
 const Collaboration = Extension.create({
   defaultOptions: <CollaborationOptions>{
-    provider: null,
     type: null,
   },