Reorganize directories (#3462)

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

docs/examples/std_swap.output

@@ -0,0 +1,2 @@
+j1 = {"one":1,"two":2} | j2 = [1,2,4,8,16]
+j1 = [1,2,4,8,16] | j2 = {"one":1,"two":2}