[allardschip]

The google bot won't touch any javascript, it will just follow links. You can consider a link to a directory to the different themes.

[facorreia]

Googling "googlebot execute javascript" indicates otherwise.

[allardschip]

I stand corrected. they use Javascript in a headless browser to generate the site previews. Detailed information on how Javascript is interpreted to index sites is hard to find. I would not count on Javascript to instruct Google Bot what to index.