Install - Improve install experience on Linux

[joaomoreno]

Issue: #2679, #269
Assignees:

• Linux - Elementary @aeschli
• Linux - Ubuntu @isidorn

Details:

Test the deb package install and uninstall on Ubuntu

1. Setup Ubuntu VM/machine
2. Download .deb package from https://vscode-builds.azurewebsites.net/alpha
3. Install by opening .deb package through Ubuntu Software Center
4. Ensure it installed correctly:
   • Opening "Code" through the launcher works
   • Running code-alpha through the terminal launches code
5. Uninstall: sudo apt-get remove visual-studio-code-alpha
6. Ensure it uninstalled correctly:
   • /bin/code-alpha should not exist
   • /usr/share/code-alpha should not exist
7. Install via command line: sudo dpkg -i vscode-amd64.deb
8. Repeat steps 4-6.

Test install and uninstall on Debian

Perform above steps on a Debian machine/VM.