[JS Version] Show the captured image on the message history + gitignores

[Fabryz]

The captured image is sent back from the nodejs server to the frontend, then it is added after the text message in the history sidebar and styled so it fits its container.

• Now using Express Static server in order to serve the static files (or it wouldn't work on my side)

I have added also

• the .env.example file
• the .gitignore files on root (to ignore PHPStorm IDE files) and on the js subfolder with the official NodeJS one

Example screenshot of the updated app:

[bdekraker]

This is cool, but has conflicts, will look into this when I have more time :)

[Fabryz]

@bdekraker resolved conflict due to previous PR's merge