removed demo project

src/pages/projects/demo.astro

@@ -1,21 +0,0 @@
----
-import ProjectPage from "../../components/ProjectPage.astro";
-
-export const metadata = {
-    title: "Demo Project",
-    description: "demo project",
-    date: "the beginning of time (date)",
-    slug: "demo",
-    hidden: true,
-};
----
-
-<ProjectPage metadata={metadata}>
-    <div class="flex flex-col">
-        demo contents (from demo.astro)
-        <b>
-            description:
-            {metadata.description}
-        </b>
-    </div>
-</ProjectPage>