Add pages to simulate HTTP and WebView errors

[nshuba]

Asana task: https://app.asana.com/0/1202096681738622/1206226802913784/f

[kdzwinel]

Nicely done 👏

The code itself looks great, but I think we can improve the structure so that the name is more specific, it's more transparent what the page does, and we can add more network issues in the future. Let's aim for something similar to https://github.com/duckduckgo/privacy-test-pages/tree/main/viewport , specifically:

• please create a new /network-error/ folder (more specific name ✅ )
• in that folder please create an index page that links to couple of error codes (e.g. 401, 403, 500) + connection lost and explains how to use those pages (more explanation what the page does ✅ )
• in that folder let's have /server/ subfolder with relevant backend routes (just modularization and avoiding one big server.js file ✅ )
• from the main index.html page let's create one link "Network errors" in the "Browser features" category (hopefully slightly easier to find ✅ )

LMK if you'd like to discuss anything above!

[nshuba]

Thanks @kdzwinel! Addressed ✅

[kdzwinel]

Works great and the code LGTM - approved! Thank you :)