fix: resolve ssr:false prerender error for docs/manual/api route (#1242)

* Initial plan

* fix: filter docs/manual/api from mdxRoutes and add ApiOverviewRoute.resi

Agent-Logs-Url: https://github.com/rescript-lang/rescript-lang.org/sessions/b7d1655e-a3e7-4c73-b113-ec2b9fdc0ce3

Co-authored-by: jderochervlk <60623931+jderochervlk@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jderochervlk <60623931+jderochervlk@users.noreply.github.com>

Author: Copilot

app/routes.res

@@ -45,7 +45,8 @@ let mdxRoutes = mdxRoutes("./routes/MdxRoute.jsx")->Array.filter(r =>
       path === "blog" ||
       String.startsWith(path, "blog/") ||
       path === "community" ||
-      String.startsWith(path, "community/")
+      String.startsWith(path, "community/") ||
+      path === "docs/manual/api"
     )
     ->Option.getOr(false)
   )

app/routes/ApiOverviewRoute.resi

@@ -0,0 +1,9 @@
+type loaderData = {
+  compiledMdx: CompiledMdx.t,
+  title: string,
+  description: string,
+}
+
+let loader: ReactRouter.Loader.t<loaderData>
+
+let default: unit => React.element