Update home page

[stefandesu]

I had some ideas/suggestions for updating the hope page to make it a big more interesting:

• Update Cocoda screenshot (still uses old design)
• Make it more visual, for example by including screenshots of other applications/services
• coli-ana and BARTOC should be displayed prominently as well, without the need to read the text

[guitarster]

Found a online tool for generating slideshows: https://www.html-code-generator.com/html/image-slideshow-generator
Perhaps, with this we could generate a slideshow with screenshots of Cocoda, BARTOC, and coli-ana.
I tested the generated code in a local instance of the coli-conc website: it works well.

[stefandesu]

I'm not a fan, personally. I would to keep the site JavaScript-free if possible. I already have ideas in mind, just need to make that a little clearer.