Improve documentation for the fullstack crate (#2952)

* improve documentation for the fullstack server context

* Add a section about axum integration to the crate root docs

* make serve_dioxus_application accept the cfg builder directly

* remove unused server_fn module

* improve fullstack config docs

* improve documentation for the server function macro

* fix axum router extension link

* Fix doc tests

* Fix launch builder

* Remove redundant server_only inside server function

* Fix isrg config path

packages/server-macro/Cargo.toml

@@ -18,6 +18,12 @@ quote = "^1.0.26"
 syn = { workspace = true, features = ["full"] }
 server_fn_macro = "0.6.11"
 
+[dev-dependencies]
+dioxus = { workspace = true, features = ["fullstack"] }
+serde = { workspace = true, features = ["derive"] }
+tower-http = { workspace = true, features = ["timeout"]}
+axum = { workspace = true }
+
 [lib]
 proc-macro = true