Use maud for test page

I want to replace askama with maud completely. It's so much nicer to be
able to use Rust code and abstractions (e.g. functions) to compose HTML
than using a bespoke templating system with weird inheritance and stuff.
Even though said template system is checked at compile time. Actually,
since it doesn't do hot reloading anyways, maud requiring a recompile
for changes to become visible doesn't make the situation worse.

src/server/web/pages/test.rs

@@ -0,0 +1,27 @@
+use axum::{extract::State, response::IntoResponse};
+use maud::html;
+
+use crate::{
+    config::ServerConfig,
+    server::web::{
+        base::{Base, Tab},
+        paths::PathTest,
+    },
+    somehow,
+};
+
+pub async fn get_test(
+    _path: PathTest,
+    State(config): State<&'static ServerConfig>,
+) -> somehow::Result<impl IntoResponse> {
+    let base = Base::new(config, Tab::Index);
+
+    Ok(base.html(
+        "test",
+        html! {},
+        html! {
+            h2 { "Test" }
+            p { "Hello world!" }
+        },
+    ))
+}