add eva icon example to ui.icon docs

website/more_documentation/icon_documentation.py

@@ -1,5 +1,17 @@
 from nicegui import ui
+from website.documentation_tools import text_demo
 
 
 def main_demo() -> None:
-    ui.icon('thumb_up')
+    ui.icon('thumb_up').classes('text-5xl')
+
+
+def more() -> None:
+    ui.add_head_html('<link href="https://unpkg.com/eva-icons@1.1.3/style/eva-icons.css" rel="stylesheet">')
+
+    @text_demo('Eva icons', '''
+        You can use [Eva icons](https://akveo.github.io/eva-icons/#/) in your app.
+    ''')
+    async def eva_icons():
+        # ui.add_head_html('<link href="https://unpkg.com/eva-icons@1.1.3/style/eva-icons.css" rel="stylesheet">')
+        ui.element('i').classes('eva eva-github').classes('text-5xl')