chore: revert to yarn 1 (#16)

`pkg` doesnt work with yarn 2

Author: trs

.gitignore

@@ -2,9 +2,4 @@ node_modules/
 dist/
 pkg/
 
-.yarn/*
-!.yarn/releases
-!.yarn/plugins
-.pnp.*
-
 .env

.yarn/releases/yarn-berry.js

@@ -74,8 +74,8 @@
     "typescript": "^3.8.3"
   },
   "dependencies": {
-    "@shift-code/api": "workspace:^0.1.0",
-    "@shift-code/source": "workspace:^0.1.0",
+    "@shift-code/api": "^0.1.0",
+    "@shift-code/source": "^0.1.0",
     "mkdirp": "^1.0.4",
     "prompts": "^2.3.2",
     "signale": "^1.4.0",