docs: Mintlify CLI, Node LTS note, config filename clarifications

Author: Dragboyz

README.md

@@ -29,7 +29,7 @@ Base Docs are community-managed. We welcome and encourage contributions from eve
 
 ## Local development
 
-Prerequisite: Node.js 18.17+ (LTS recommended). Tested with Node 20/22.
+Prerequisite: Node.js 18.17+ (LTS recommended). Also tested with Node 20 and 22.
 
 1. Clone the repository.
 2. Install the Mintlify CLI to preview documentation changes locally:
@@ -45,7 +45,7 @@ cd docs
 npx mintlify dev
 ```
 
-Alternatively, without a global install:
+Alternatively, without a global install (recommended to avoid global dependencies):
 
 ```bash
 npx mintlify dev
@@ -54,7 +54,9 @@ npx mintlify dev
 ### Troubleshooting
 
 - Ensure Node.js 18.17+ is installed and that you run `npx mintlify dev` from the directory containing your Mintlify config (`docs.json` or `mint.json`) (usually `docs/`).
-- Local preview differs from production: run `npx mintlify update` to update the CLI.
+- If local preview differs from production, run the latest CLI:
+  - `npx mintlify@latest dev` (no global install), or
+  - `npm i -g mintlify@latest` (to update a global install)
 
 ## How to contribute