Add installation instructions and improve note placement

Following review feedback, this commit:
- Adds installation instructions for both overmind and foreman
- Moves the note before the command block so developers see prerequisites first
- Confirms file ends with newline as required by CLAUDE.md

Installation instructions include:
- overmind: brew install for macOS with link to full installation guide
- foreman: gem install with important note about global installation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: justin808

docs/getting-started.md

@@ -66,6 +66,11 @@ cd PROJECT_NAME
    bundle exec rails generate react_on_rails:install
    ```
 
+> **Note:** Ensure that you have `overmind` or `foreman` installed to run `bin/dev`.
+>
+> - **overmind**: `brew install overmind` (macOS) or see [installation guide](https://github.com/DarthSim/overmind#installation)
+> - **foreman**: `gem install foreman` (install globally, not in your project bundle - [details](https://github.com/ddollar/foreman/wiki/Don't-Bundle-Foreman))
+
 Start the app:
 
 ```bash
@@ -74,8 +79,6 @@ bin/dev # start with hmr
 bin/dev static # start with statically created bundles (no HMR)
 ```
 
-> **Note:** Ensure that you have `overmind` or `foreman` installed to run `bin/dev`.
-
 ## Basic Usage
 
 ### Configuration