init: add basic strcuture based on quartz

src/index.d.ts

@@ -0,0 +1,15 @@
+declare module "*.scss" {
+  const content: string
+  export = content
+}
+
+// dom custom event
+interface CustomEventMap {
+  prenav: CustomEvent<{}>
+  nav: CustomEvent<{ url: FullSlug }>
+  themechange: CustomEvent<{ theme: "light" | "dark" }>
+  readermodechange: CustomEvent<{ mode: "on" | "off" }>
+}
+
+type ContentIndex = Record<FullSlug, ContentDetails>
+declare const fetchData: Promise<ContentIndex>