Remove broken link in front-end/design (yangshun#69)

Author: sibeitokgong

front-end/design.md

@@ -12,7 +12,3 @@ Talk me through a full stack implementation of an autocomplete widget. A user ca
 - What does the backend API look like?
 - What perf considerations are there for complete-as-you-type behavior? Are there any edge cases (for example, if the user types fast and the network is slow)?
 - How would you design the network stack and backend in support of fast performance: how do your client/server communicate? How is your data stored on the backend? How do these approaches scale to lots of data and lots of clients?
-
-###### References
-
-- https://performancejs.com/post/hde6d32/The-Best-Frontend-JavaScript-Interview-Questions-%28written-by-a-Frontend-Engineer%29