Remove unique_ptr exercise

exercises/17/README.md

@@ -1,3 +1 @@
 [< Back](../README.md)
-
-* [Exercise: std::unique_ptr<PacMan>](unique_ptr_pacman/README.md)

exercises/17/unique_ptr_pacman/README.md

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-[< Back](../README.md)
-
-# Exercise: std::unique_ptr<PacMan>
-
-## Background:
-
-(corentin: maybe something about } that destroys things)
-We are going to play with using std::unique_ptr as we discussed in the slides. Since we will be reverting these changes
-back, do take a copy of the GameState files before we start. We will change PacMan within GameState into a std::
-unique_ptr<PacMan>, once this has been done the code will not compile, because there are further changes needed within
-the GameState class. Go through and figure out what needs to be updated. Can we change one of the ghosts into a std::
-unique_ptr? Are there any current design problems we will run into? What do these design issues say about ownership of
-data?
-
-## Exercise
-
-1.