move examples/ and tests/ out of lang/

Author: xieyuheng

docs/lang/examples/boolean.scm renamed to docs/examples/boolean.scm

@@ -15,9 +15,11 @@
     "build": "tsc",
     "build:watch": "tsc --watch",
     "test:node": "node --test",
-    "test:lang:tests": "test-runner snapshot './bin/lambda.js run' 'docs/lang/**/*.scm' --exclude 'docs/lang/**/*.error.scm'",
-    "test:lang:tests-error": "test-runner snapshot-error './bin/lambda.js run' 'docs/lang/**/*.error.scm'",
-    "test:lang": "npm run test:lang:tests && npm run test:lang:tests-error",
+    "test:lang:tests": "test-runner snapshot './bin/lambda.js run' 'docs/tests/**/*.scm' --exclude 'docs/tests/**/*.error.scm'",
+    "test:lang:examples": "test-runner snapshot './bin/lambda.js run' 'docs/examples/**/*.scm' --exclude 'docs/examples/**/*.error.scm'",
+    "test:lang:tests-error": "test-runner snapshot-error './bin/lambda.js run' 'docs/tests/**/*.error.scm'",
+    "test:lang:examples-error": "test-runner snapshot-error './bin/lambda.js run' 'docs/examples/**/*.error.scm'",
+    "test:lang": "npm run test:lang:tests && npm run test:lang:tests-error && npm run test:lang:examples && npm run test:lang:examples-error",
     "test": "npm run test:node && npm run test:lang",
     "format": "prettier src docs --write"
   },