Refactor the Vue source code

[djalilhebal]

I have written this thing while I was offline and, specifically, the Vue part after checking a few pages of the Vue docs, the rest was kinda improvised/"hacked".

The code is not idiomatic and does not leverage most of Vue's features.

Although the app no longer works for me (Djezzy's Facebook Zero was discontinued), this app needs to be refactored.

• Proper state management

• Use ES imports (instead of HTML script tags)