Project updates from Template (#1)

This PR contains the latest updates from the generic Website template, which have been added while working on #loud-amsterdam.

Reviewed-on: #1
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>

Services/Website/Tests/Library/Cases/Internal/Pages/IndexPageTests.swift

@@ -32,6 +32,39 @@ struct IndexPageTests {
         #expect(html.contains("/js/index.js"))
     }
 
+    @Test
+    func `renders no font preloads until fonts are declared`() {
+        // The template ships no fonts, so a preload link here would point at a file the service does not serve.
+        #expect(IndexPage.preloadedFonts.isEmpty)
+        #expect(!IndexPage(locale: .init(identifier: "en")).render().contains(#"rel="preload""#))
+    }
+
+    @Test
+    func `renders no canonical URL until an origin is given`() {
+        #expect(!IndexPage(locale: .init(identifier: "en")).render().contains(#"rel="canonical""#))
+    }
+
+    @Test
+    func `renders the canonical URL as the bare origin for the default language`() {
+        // The root is the one path with no trailing slash for `TrailingSlashRedirectMiddleware` to strip.
+        let html = IndexPage(
+            locale: .init(identifier: "en"),
+            siteOrigin: "https://example.com"
+        ).render()
+
+        #expect(html.contains(#"<link rel="canonical" href="https://example.com">"#))
+    }
+
+    @Test
+    func `renders no language alternates for a single-language catalog`() {
+        // The template serves one language, so a set naming one edition would tell a crawler nothing.
+        #expect(Language.all.count == 1)
+        #expect(!IndexPage(
+            locale: .init(identifier: "en"),
+            siteOrigin: "https://example.com"
+        ).render().contains("hreflang"))
+    }
+
     @Test
     func `renders versioned asset URLs when given a version`() {
         let html = IndexPage(