[ui] Clean up legacy theme, product tour #18938
Merged
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Summary & Motivation
Remove legacy theme and product tour now that themes have been out for a while. Default users to "System setting" theme if they haven't explicitly chosen Light or Dark.
How I Tested These Changes
Set my
dagster-theme
localStorage value to "Legacy", verify that I get the system theme. Repeat with "foo" and with the value deleted from localStorage, verify same. Set theme to "Light" and "Dark", verify that these work properly.