I'm guessing that the page designer just went to a stock photo site, did a search for "code" or something similar, found that image, licensed it, and inserted it. Job done!

I asked TinEye [1] where I can get that stock photo. It turns out you can get it at most of the big stock photo sites. For example, here it is on Shutterstock: https://www.shutterstock.com/image-photo/software-source-cod...

[1] https://tineye.com/