Repacks the official Electron build vk.me/app serves directly (no GitHub
release or distro repo for this product). Upstream's own .deb installs
under the literal Cyrillic product name /opt/VK Мессенджер — package()
resolves that directory dynamically instead of hardcoding it, then lays
the payload out under a clean /opt/vk-messenger to match this repo's
convention.
