Removes `rimraf` for a smaller custom lib

Benchmarks (in ms):
```
rimraf 1
518.536376
rimraf 2
416.112451
rimraf 3
451.905842
rimraf 4
525.117395
rimraf 5
434.230384
---- Average: 469.18ms
-----------
recursive delete 1
121.493979
recursive delete 2
130.335272
recursive delete 3
149.798316
recursive delete 4
182.184688
recursive delete 5
130.346207
--- Average: 142.83ms
```
`recursiveDelete` finishes in ~30% of the time it takes `rimraf` (3.3 times faster)