docs: update README

Author: 9romise

README.md

@@ -16,12 +16,16 @@
 
 ## Features
 
-- **Hover Information** - Quick links to [npmx.dev](https://npmx.dev) for package info and documentation, with provenance verification status
-- **Version Completion** - Autocomplete package versions with provenance filtering support
+- **Hover Information** – Quick links to package details and documentation on [npmx.dev](https://npmx.dev), with provenance verification status.
+- **Version Completion** – Autocomplete package versions with provenance filtering and prerelease exclusion support.
 - **Diagnostics**
-  - Deprecated package warnings
+  - Deprecated package warnings with deprecation messages
   - Package replacement suggestions (via [module-replacements](https://github.com/es-tooling/module-replacements))
-  - Vulnerability detection
+  - Vulnerability detection powered by the [OSV](https://osv.dev/) database, with severity levels (critical, high, moderate, low)
+  - Upgrade hints when a newer version is available, with quick-fix code actions
+- **Commands**
+  - Open [npmx.dev](https://npmx.dev) in external browser
+  - Open `node_modules` files on [npmx.dev](https://npmx.dev) code viewer with syntax highlighting (from editor title, context menu, or command palette)
 
 ## Supported Files
 
@@ -44,6 +48,11 @@
 
 <!-- configs -->
 
+## Related
+
+- [npmx.dev](https://npmx.dev) &ndash; A fast, modern browser for the npm registry
+- [npmx-replace-extension](https://github.com/tylersayshi/npmx-replace-extension) &ndash; Browser extension to redirect npmjs.com to npmx.dev
+
 ## Contributing
 
 Contributions are welcome! Please review our [contribution guide](./CONTRIBUTING.md) for more details.