[Feature Request] Restore the Ability to Add Custom Search Engines in Web Search

[Ilya-Green]

Is your feature request related to a problem? Please describe.
In ueli version 9.4.0, I can't find an option to add a new search engine in the Web Search settings. In version 8.26.0, I could add any search engine I wanted, such as YouTube, GitHub, Wikipedia, Google Maps, etc. After updating to the latest version, this functionality seems to be missing.

Describe the solution you'd like
I would like to have the ability to add custom search engines in the new versions of ueli, just like it was possible in previous versions.