remove old svelte web source

src/components/site_header.rs

@@ -0,0 +1,17 @@
+pub struct Link {
+    pub href: String,
+    pub label: String,
+}
+
+#[derive(Default)]
+pub struct HeaderProps {
+    pub back_link: Option<Link>,
+}
+
+impl HeaderProps {
+    pub fn with_back_link(link: Link) -> Self {
+        Self {
+            back_link: Some(link),
+        }
+    }
+}