Update web readme (#12062)

* Update web readme

* Update /web readme

* Apply suggestions from code review

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

---------

Co-authored-by: Sam Wright <sam@sams-mbp.lan>
Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

web/.vscode/extensions.json

@@ -0,0 +1,5 @@
+{
+    "recommendations": [
+      "dbaeumer.vscode-eslint"
+    ]
+  }

web/README.md

@@ -1,30 +1,25 @@
-# React + TypeScript + Vite
+This is the Frigate frontend which connects to and provides a User Interface to the Python backend.
 
-This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+# Web Development
 
-Currently, two official plugins are available:
+## Installing Web Dependencies Via NPM
 
-- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react/README.md) uses [Babel](https://babeljs.io/) for Fast Refresh
-- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+Within `/web`, run:
 
-## Expanding the ESLint configuration
-
-If you are developing a production application, we recommend updating the configuration to enable type aware lint rules:
-
-- Configure the top-level `parserOptions` property like this:
-
-```js
-export default {
-  // other rules...
-  parserOptions: {
-    ecmaVersion: 'latest',
-    sourceType: 'module',
-    project: ['./tsconfig.json', './tsconfig.node.json'],
-    tsconfigRootDir: __dirname,
-  },
-}
+```bash
+npm install
 ```
 
-- Replace `plugin:@typescript-eslint/recommended` to `plugin:@typescript-eslint/recommended-type-checked` or `plugin:@typescript-eslint/strict-type-checked`
-- Optionally add `plugin:@typescript-eslint/stylistic-type-checked`
-- Install [eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react) and add `plugin:react/recommended` & `plugin:react/jsx-runtime` to the `extends` list
+## Running development frontend
+
+Within `/web`, run:
+
+```bash
+PROXY_HOST=<ip_address:port> npm run dev
+```
+
+The Proxy Host can point to your existing Frigate instance. Otherwise defaults to `localhost:5000` if running Frigate on the same machine.
+
+## Extensions
+Install these IDE extensions for an improved development experience:
+- eslint