Fix bin/publish: copy docs.dist from project root

Fix bin/publish: use correct .env path for rspade_system
Fix bin/publish script: prevent grep exit code 1 from terminating script

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Co-Authored-By: Claude <noreply@anthropic.com>

node_modules/collect.js/docs/api/toJson.md

@@ -0,0 +1,17 @@
+# `toJson()`
+
+The toJson method converts the collection into JSON string:
+
+```js
+const collection = collect({
+  id: 384,
+  name: 'Rayquaza',
+  gender: 'NA',
+});
+
+const json = collection.toJson();
+
+// {"id": 384, "name": "Rayquaza", "gender": "NA"}
+```
+
+[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/toJson.js)