Revert "update lean4web dependency"

This reverts commit 6bced7575b.

client/src/connection.ts

@@ -3,9 +3,8 @@
  */
 
 import * as React from 'react';
+import * as monaco from 'monaco-editor/esm/vs/editor/editor.api.js'
 import { LeanClient } from 'lean4web/client/src/editor/leanclient';
-import { IConnectionProvider } from 'monaco-languageclient'
-import { toSocket, WebSocketMessageReader, WebSocketMessageWriter } from 'vscode-ws-jsonrpc'
 
 export class Connection {
   private game: string = undefined // We only keep a connection to a single game at a time
@@ -19,32 +18,8 @@ export class Connection {
       this.game = game
       // Start a new Lean client for the new `gameId`.
       const socketUrl = ((window.location.protocol === "https:") ? "wss://" : "ws://") + window.location.host + '/websocket/' + game
-
-      const connectionProvider : IConnectionProvider = {
-        get: async () => {
-          return await new Promise((resolve, reject) => {
-            console.log(`connecting ${socketUrl}`)
-            const websocket = new WebSocket(socketUrl)
-            websocket.addEventListener('error', (ev) => {
-              reject(ev)
-            })
-            websocket.addEventListener('message', (msg) => {
-              // console.log(msg.data)
-            })
-            websocket.addEventListener('open', () => {
-              const socket = toSocket(websocket)
-              const reader = new WebSocketMessageReader(socket)
-              const writer = new WebSocketMessageWriter(socket)
-              resolve({
-                reader,
-                writer
-              })
-            })
-          })
-        }
-      }
-
-      this.leanClient = new LeanClient(connectionProvider, () => {})
+      const uri = monaco.Uri.parse('file:///')
+      this.leanClient = new LeanClient(socketUrl, undefined, uri, () => {})
     }
 
     return this.leanClient