Add drop and drop_right snippets

snippets/drop.md

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+---
+title: drop
+tags: list,beginner
+---
+
+Returns a list with `n` elements removed from the left.
+
+Use slice notation to remove the specified number of elements from the left.
+
+```py
+def drop(a, n = 1):
+  return a[n:]
+```
+
+```py
+drop([1, 2, 3]) # [2, 3]
+drop([1, 2, 3], 2) # [3]
+drop([1, 2, 3], 42) # []
+```

snippets/drop_right.md

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+---
+title: drop_right
+tags: list,beginner
+---
+
+Returns a list with `n` elements removed from the right.
+
+Use slice notation to remove the specified number of elements from the right.
+
+```py
+def drop_right(a, n = 1):
+  return a[:-n]
+```
+
+```py
+drop_right([1, 2, 3]) # [1, 2]
+drop_right([1, 2, 3], 2) # [1]
+drop_right([1, 2, 3], 42) # []
+```