add expo, massively simplify svelte and solid examples

template/apps/<@if(eq(context.project.mobile,"expo"))>mobile/src/app/_layout.tsx

@@ -1,5 +1,5 @@
 import { Stack } from "expo-router";
 
 export default function RootLayout() {
-  return <Stack />;
+  return <Stack screenOptions={{headerShown:false}} />;
 }

template/apps/<@if(eq(context.project.mobile,"expo"))>mobile/src/app/index.tsx

@@ -47,7 +47,7 @@ export default function Index() {
   return (
     <Host style={{ flex: 1 }}>
       <Column alignment="center" modifiers={[fillMaxWidth()]}>
-        <Text> create todo </Text>
+        <Text textStyle={{fontSize:30}}> Create Todo </Text>
         <TextInput value={todoToCreateTask} onChangeText={updateTodoToCreateTask} />
         <Button modifiers={[controlSize('regular')]} label="create Todo" onPress={createTodo} />
         <ScrollView modifiers={[fillMaxWidth()]}>