Re-export the axum feature flag under "server" (#2786)

* re-export the axum feature flag under "server"
* remove the axum prefix from all the fullstack examples

packages/fullstack/examples/desktop/Cargo.toml

@@ -0,0 +1,28 @@
+[package]
+name = "fullstack-desktop-example"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+
+[dependencies]
+dioxus = { workspace = true, features = ["launch", "fullstack"] }
+axum = { workspace = true, optional = true }
+tokio = { workspace = true, features = ["full"], optional = true }
+serde = "1.0.159"
+
+[features]
+default = []
+server = ["axum", "tokio", "dioxus/axum"]
+desktop = ["dioxus/desktop"]
+
+[[bin]]
+name = "client"
+path = "src/client.rs"
+required-features = ["desktop"]
+
+[[bin]]
+name = "server"
+path = "src/server.rs"
+required-features = ["server"]