chore: modify readme

Author: zabackary

.gitignore

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 /target
 **/node_modules
+**/build

www/README.md

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-# open-chess-clock-frontend
+# OpenChessClock Web
 
-A browser display for `open-chess-clock`.
+A browser display for `open-chess-clock`. A vanilla JS web app built with Vite.
+
+A little bit hacky, but it works! The website can connect to a chess clock
+flashed with [this firmware](../README.md)!
+
+## Screenshots
+
+![selection screen](./assets/selection.png)
+![synced with a physical clock](./assets/sync.png)
+
+## Translations
+
+I'd love to translate this, but this was a quick-and-dirty (though not as dirty
+as some other projects) web app and isn't set up for that. PRs welcome!
+
+## Dev server
+
+Run `pnpm dev` to start up the dev server on `localhost:5173`. The port may
+differ if port 5173 isn't available. You should see a message from Vite telling
+you the port number.
+
+## Build instructions
+
+Run `pnpm build` to type-check and run the build script.