Moves search paths to nimble.nim.cfg (#1317)

* moves search paths to `nimble.nim.cfg`

* keep paths for tests

Author: jmgomez

src/nimble.nim.cfg

@@ -2,5 +2,8 @@
 #--noNimblePath
 --path:"$nim/"
 --path:"./vendor/nim"
+--path:"../vendor/zippy/src"
+--path:"../vendor/sat/src"
+--path:"../vendor/checksums/src"
 -d:ssl
 -d:nimcore # Enable 'gorge' in Nim's VM. See https://github.com/nim-lang/Nim/issues/8096