chore(deps): Updated to Theia 1.39.0 (#2144)

- update Theia to `1.39.0`,
 - remove the application packager and fix the security vulnerabilities,
 - bundle the backed application with `webpack`, and
 - enhance the developer docs.

Co-authored-by: Akos Kitta <a.kitta@arduino.cc>
Co-authored-by: per1234 <accounts@perglass.com>

Signed-off-by: Akos Kitta <a.kitta@arduino.cc>

electron-app/scripts/notarize.js

@@ -0,0 +1,46 @@
+// @ts-check
+'use strict';
+
+const isCI = require('is-ci');
+const { notarize } = require('electron-notarize');
+
+exports.default = async function notarizing(context) {
+  if (!isCI) {
+    console.log('Skipping notarization: not on CI');
+    return;
+  }
+  const { electronPlatformName, appOutDir } = context;
+  if (electronPlatformName !== 'darwin') {
+    console.log('Skipping notarization: not on macOS');
+    return;
+  }
+  if (process.env.CAN_SIGN !== 'true') {
+    console.log('Skipping the app notarization: certificate was not provided');
+    return;
+  }
+
+  if (!process.env.AC_USERNAME) {
+    throw new Error('AC_USERNAME must be set when notarizing on macOS');
+  }
+  if (!process.env.AC_PASSWORD) {
+    throw new Error('AC_PASSWORD must be set when notarizing on macOS');
+  }
+  if (!process.env.AC_TEAM_ID) {
+    throw new Error('AC_TEAM_ID must be set when notarizing on macOS');
+  }
+
+  const appName = context.packager.appInfo.productFilename;
+  const appBundleId = context.packager.config.appId;
+  console.log(
+    `>>> Notarizing ${appBundleId} at ${appOutDir}/${appName}.app...`
+  );
+
+  await notarize({
+    appBundleId,
+    appPath: `${appOutDir}/${appName}.app`,
+    appleId: process.env.AC_USERNAME,
+    appleIdPassword: process.env.AC_PASSWORD,
+    teamId: process.env.AC_TEAM_ID,
+    tool: 'notarytool',
+  });
+};