Use HX-Target, not HX-Boost for Layout render

HX-Boost is not always sent in all AJAX requests that htmx sends, only
those initiated by an element with hx-boost enabled. It was not showing
up on requests following an HX-Redirect response.

After reading the docs more, I realized HX-Target was what I wanted. If
I can see that the request is targeting `#main-content` then I know to
only return HTML inside that element. Simple.

src/handlers/home.rs

@@ -5,18 +5,18 @@ use maud::html;
 use sqlx::PgPool;
 
 use crate::error::Result;
-use crate::htmx::HXBoosted;
+use crate::htmx::HXTarget;
 use crate::models::entry::Entry;
 use crate::partials::{entry_list::entry_list, layout::Layout};
 
 pub async fn get(
     State(pool): State<PgPool>,
-    hx_boosted: Option<TypedHeader<HXBoosted>>,
+    hx_target: Option<TypedHeader<HXTarget>>,
     layout: Layout,
 ) -> Result<Response> {
     let options = Default::default();
     let entries = Entry::get_all(&pool, &options).await?;
-    Ok(layout.boosted(hx_boosted).render(html! {
+    Ok(layout.targeted(hx_target).render(html! {
         ul class="entries" {
             (entry_list(entries, &options))
         }