Fix an issue with binary public file corruption (#110)

* Ensure head is rendered for SSG

It seems the implementation was intended to achieve this sort of isolation the same way `docContext` is used. But the `useRef` version was basically just sending any children in `Head` into the memory hole on build.

* Add another page just to validate that each page gets a new head context as expected

* Fix an issue with binary public file corruption

The previous behavior was reading binary files as strings, which was corrupting them on output

packages/microsite/src/utils/fs.ts

@@ -48,11 +48,15 @@ export const copyFile = async (
   dest: string,
   { transform }: CopyFileOpts = {}
 ) => {
-  let content = await fsp.readFile(src).then((res) => res.toString());
   if (transform) {
+    let content = await fsp.readFile(src).then((res) => res.toString());
     content = await transform(content);
+    await writeFile(dest, content);
+  }
+  else {
+    await mkdir(dirname(dest));
+    await fsp.copyFile(src, dest);
   }
-  await writeFile(dest, content);
 };
 
 export const copyDir = async (src: string, dest: string) => {