move icon registration into module level

ezgg_website/__init__.py

@@ -9,6 +9,12 @@ from . import pages
 from . import components as comps
 from . import services
 
+rio.Icon.register_single_icon(
+    set_name="custom",
+    icon_name="steam",
+    icon_source=from_root("ezgg_website/assets/icons/steam.svg")
+)
+
 themes = [
     # Grey/Purple
     rio.Theme.from_colors(
@@ -100,11 +106,6 @@ themes = [
 
 async def on_session_start(s: rio.Session) -> None:
     await s.set_title("EZ GG e.V.")
-    rio.Icon.register_single_icon(
-        set_name="custom",
-        icon_name="steam",
-        icon_source=from_root("ezgg_website/assets/icons/steam.svg")
-    )
 
 # Create the Rio app
 app = rio.App(