docs: update titles in readme

Author: matrei

README.md

@@ -10,12 +10,12 @@ HTTP headers into responses, implementing the [W3C Server Timing specification](
 It automatically tracks controller action time, view rendering time, and total request time – surfacing them directly in
 your browser's DevTools.
 
-## Documentation
+## 📖 Documentation
 
 Full documentation is available at the [project documentation site](https://grails-plugins.github.io/grails-server-timing/).
 This includes architecture details, the W3C specification, security considerations, and browser DevTools usage guides.
 
-## Quick Start
+## 🚀 Quick Start
 
 Add the dependency to your `build.gradle`:
 
@@ -66,7 +66,7 @@ dependencies {
 > Snapshot versions are unstable and may change without notice. They are intended for testing
 > upcoming changes before a release.
 
-## How It Works
+## ❔ How It Works
 
 The plugin intercepts HTTP requests using a servlet filter and a Grails interceptor:
 
@@ -87,7 +87,7 @@ Server-Timing: total;dur=156.3;desc="Total", action;dur=45.2;desc="Action", view
 | Controller with render (JSON, text) | `total`, `action`         |
 | Static assets / other resources     | `total`, `other`          |
 
-## Viewing in Browser DevTools
+## 🌐 Viewing in Browser DevTools
 
 Open DevTools (F12), go to the **Network** tab, click a request, and select the **Timing** tab. Metrics
 appear under "Server Timing":
@@ -96,7 +96,7 @@ appear under "Server Timing":
 - **Firefox** 61+
 - **Safari** 16.4+
 
-## Configuration
+## ⚙️ Configuration
 
 Configure in `application.yml` under `grails.plugins.servertiming`:
 
@@ -121,13 +121,13 @@ environments:
                     enabled: false
 ```
 
-## Compatibility
+## 🤝 Compatibility
 
 | Plugin Version | Grails | Java | Groovy |
 |----------------|--------|------|--------|
 | 0.x            | 7.0.x  | 17+  | 4.0.x  |
 
-## Building from Source
+## 🔨 Building from Source
 
 Prerequisites: [SDKMAN!](https://sdkman.io/)
 
@@ -138,7 +138,7 @@ sdk env install    # Install Java 17, Gradle 8.14, Groovy 4.0
 
 See [CONTRIBUTING.md](CONTRIBUTING.md) for the full development setup.
 
-## Contributing
+## 💡 Contributing
 
 Contributions are welcome! Please read [CONTRIBUTING.md](CONTRIBUTING.md) before submitting a pull request.