Use head elements and new manganis syntax in examples (#2688)

* use head elements and new manganis syntax in examples
* only enable desktop workspace example scraping during a dioxus release

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/html/src/document/head.rs

@@ -245,7 +245,7 @@ impl ScriptProps {
 ///     rsx! {
 ///         // You can use the Script component to render a script tag into the head of the page
 ///         Script {
-///             src: manganis::mg!(file("./assets/script.js")),
+///             src: asset!("./assets/script.js"),
 ///         }
 ///     }
 /// }
@@ -435,7 +435,7 @@ impl LinkProps {
 ///         // You can use the meta component to render a meta tag into the head of the page
 ///         // This meta tag will redirect the user to the dioxuslabs homepage in 10 seconds
 ///         head::Link {
-///             href: manganis::mg!(file("./assets/style.css")),
+///             href: asset!("./assets/style.css"),
 ///             rel: "stylesheet",
 ///         }
 ///     }