add ux question

lectures/user-experience/slides.qmd

@@ -507,3 +507,5 @@ Take safe_copy.py and add useful error messages and return codes.
   [UHH Library system](https://katalogplus.sub.uni-hamburg.de/vufind/Record/168729271X) | [MPS ebooks](https://ebooks.mpdl.mpg.de/ebooks/Record/EB001950880) | [German ebook via UHH](https://katalogplus.sub.uni-hamburg.de/vufind/Record/1755846843))
 * *Defensive Programming and “Fail Fast”* (in Ch 13 of *Fluent Python*).
 * *with, match, and else Blocks* (Ch 18 of *Fluent Python*).
+
+# What's your UX with this lecture series? {.special}
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