fix links

docs/developer-docs/web-apps/application-frontends/overview.mdx

@@ -133,8 +133,6 @@ let path = HttpCertificationPath::wildcard("/js");
 
 - Using [raw HTML and JavaScript](/docs/current/motoko/main/getting-started/motoko-introduction) to display a simple HTML entry page.
 
-- Using [React and TypeScript](./add-stylesheet.mdx) to import CSS properties from an external file.
-
 - [Vite + React + Motoko](https://github.com/rvanasa/vite-react-motoko) template example.
 
 - [Vite + SvelteKit + Motoko](https://github.com/letmejustputthishere/vite-sveltekit-motoko-ii/tree/main) template example.

docs/developer-docs/web-apps/application-frontends/webpack.mdx

@@ -18,8 +18,7 @@ In many cases, you can use the default `webpack.config.js` file as is, without a
 plugins, modules, and other custom configurations to suit your needs. The specific changes you make to
 the `webpack.config.js` configuration largely depends on the other tools and frameworks you want to use.
 
-For example, if you have experimented with the [using the default frontend canister](default-frontend.mdx)
-or [using CSS to style frontends](add-stylesheet.mdx) tutorials, you might have modified the following section to work with React
+For example, if you have experimented with the default frontend canister, you might have modified the following section to work with React
 JavaScript:
 
 ```js