Avoid deleting the workspace when it's still in use.

- From now on, NSFW service disposes after last reference
is removed. No more 10sec delay.
 - Moved the temp workspace deletion to a startup task.
 - Can set initial task for the window from electron-main.
 - Removed the `browser-app`.

Closes #39

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

scripts/update-version.js

@@ -27,7 +27,6 @@ console.log(`🛠️ Updating current version from '${currentVersion}' to '${tar
 for (const toUpdate of [
     path.join(repoRootPath, 'package.json'),
     path.join(repoRootPath, 'electron-app', 'package.json'),
-    path.join(repoRootPath, 'browser-app', 'package.json'),
     path.join(repoRootPath, 'arduino-ide-extension', 'package.json')
 ]) {
     process.stdout.write(`  Updating ${toUpdate}'...`);