frontend: add possibility to run as an Electron app

[TSC21]

Adds the ability of launching the frontend as an Electron app.

To test:

$ npm run build
$ npm start    # or directly using 'electron electron.js'

It will be followed by a packager that's able to create an exectuable - currently pointing to electron-packager.

[TSC21]

Most of the changes in package-lock.json are merely updates and not harmful.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
0 Code Smells

0.0% Coverage
0.0% Duplication