[bug] Can't set default Ask vs Search, What's New and Walkthough have same issue. #530

Describe the bug

The UI always defaults to Ask after a browser restart. It'd be nice if it remembered the last selected item or if we could set it as an ENV.

To reproduce

1. Go to site.
2. In the dropdown, change to "Search".
3. Close browser.
4. Go to site again.
5. Defaults to "Ask"

Sourcebot deployment information

version: v4.7.1

Additional information

Not a biggie, just an annoyance. Thanks for the great project!
Not sure if some if new and walkthrough/intro are related to the docker container upgrading and restarting or not, FYI.