feat(docs): enhance feature list with icons for better visibility

docs/index.md

@@ -15,22 +15,28 @@ hero:
       link: https://chromewebstore.google.com/detail/the-source-taster/leggmjghcbdfilhfkgnllhnhhbalpanp?hl=de
 
 features:
-  - title: 🔍 Smart Detection
+  - icon: 🔍
+    title: Smart Detection
     details: Automatically identifies and extracts DOIs from academic papers, PDFs, and websites with intelligent pattern recognition
 
-  - title: ⚡ Lightning Fast
+  - icon: ⚡
+    title: Lightning Fast
     details: Get instant validation results through efficient API integration with Crossref and DOI resolution services
 
-  - title: 📊 Clear Reports
+  - icon: 📊
+    title: Clear Reports
     details: Generate comprehensive validation reports showing existing, missing, and invalid sources at a glance
 
-  - title: 🎯 High Precision
+  - icon: 🎯
+    title: High Precision
     details: Ensures accurate source validation with multiple verification methods and cross-referencing
 
-  - title: 🔄 Seamless Import
+  - icon: 🔄
+    title: Seamless Import
     details: Import sources through context menu, drag & drop PDFs, or direct text input for maximum flexibility
 
-  - title: 🌐 Browser Integration
+  - icon: 🌐
+    title: Browser Integration
     details: Works right where you need it with convenient browser extension access and intuitive controls
 
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