chore(web): replaces setup script with README instructions

[`yarn global` is deprecated in Yarn 2.x](https://yarnpkg.com/migration/guide#use-yarn-dlx-instead-of-yarn-global), instead `yarn dlx` is recommended for temporary installs.

apps/web/package.json

@@ -3,7 +3,6 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "setup": "vercel env pull",
     "dev": "next dev",
     "build": "next build",
     "start": "next start",

package.json

@@ -13,7 +13,6 @@
   "scripts": {
     "dev": "yarn --cwd apps/web dev",
     "lint": "yarn --cwd apps/web lint --fix && yarn --cwd apps/firebase lint --fix",
-    "setup": "yarn global add vercel@latest",
     "prepare": "husky install",
     "prettify": "yarn prettier --write \"apps/**/*.{ts,tsx}\" --ignore-path=./.gitignore"
   },

readme.md

@@ -8,7 +8,61 @@ This Repo contains the code for the alfajores faucet. This is contained in 2 app
 
 The web app deploys automatically to vercel.
 
-To setup the web app to run locally set the vercel project to clabs/faucet and the env variables from vercel with `vercel env pull` then run `yarn dev`
+## Setup
+
+### Wep app
+
+To set up the web app to run locally:
+
+1.  navigate to the `apps/web` folder
+    ```sh
+    $ cd apps/web
+    ```
+
+1. link your local repository to the `faucet` project on Vercel
+
+    ```sh
+    $ yarn dlx vercel@latest link
+    ```
+
+    You'll be asked to authenticate with your Vercel account. Once you've done that, you'll be 
+    guided through a series of prompts to link your local project to the `faucet` Vercel project.
+
+    ```
+    ? Set up “~/Documents/celo-org/faucet/apps/web”? [Y/n] y
+    ? Which scope should contain your project? Celo Ecosystem Project Hosting
+    ? Link to existing project? [y/N] y
+    ? What’s the name of your existing project? faucet
+    ✅  Linked to c-labs/faucet (created .vercel)
+    ```
+1. fetch environment variables from Vercel
+
+    ```sh
+    $ yarn dlx vercel@latest env pull
+    ```
+
+    If you get an error like `Error! No project found`, you may need to run `vercel link` again.
+    If everything worked, you should see a message like this:
+
+    ```sh
+    > Downloading `development` Environment Variables for Project faucet
+    ✅  Created .env.local file  [249ms]
+    ```
+
+1. run the app locally
+
+    ```sh
+    $ yarn dev
+    ```
+
+    You should see a message like this:
+
+    ```sh               
+    ready - started server on 0.0.0.0:3000, url: http://localhost:3000
+    info  - Loaded env from /Users/arthur/Documents/celo-org/faucet/apps/web/.env.local
+    ```
+
+    You can now view the app in your browser at http://localhost:3000.
 
 ## Adding chains