chore: rename ctx to cx

packages/web/examples/query.rs

@@ -5,10 +5,10 @@
 //     wasm_bindgen_futures::spawn_local(WebsysRenderer::start(Example));
 // }
 
-// fn Example(ctx: Context, props: ()) -> VNode {
-//     let user_data = use_sql_query(&ctx, USER_DATA_QUERY);
+// fn Example(cx: Context, props: ()) -> VNode {
+//     let user_data = use_sql_query(&cx, USER_DATA_QUERY);
 
-//     ctx.render(rsx! {
+//     cx.render(rsx! {
 //         h1 { "Hello, {username}"}
 //         button {
 //             "Delete user"