Reorganize directories (#3462)

* 🚚 move files
* 🚚 rename doc folder to docs
* 🚚 rename test folder to tests

docs/examples/json_lines.output

@@ -0,0 +1,4 @@
+{"name":"Gilbert","wins":[["straight","7♣"],["one pair","10♥"]]}
+{"name":"Alexa","wins":[["two pair","4♠"],["two pair","9♠"]]}
+{"name":"May","wins":[]}
+{"name":"Deloise","wins":[["three of a kind","5♣"]]}