Init vercel deploy (#19)

- redirect `phpup.vercel.app` to GitHub repo
- redirect `phpup.vercel.app/install` to [./.ci/install.sh](https://raw.githubusercontent.com/masan4444/phpup/feture/vercel-deploy-init/.ci/install.sh)
- host the install script statically in the future

Author: masan4444

README.md

@@ -14,16 +14,18 @@
 
 ## Quick Start (Linux, macOS)
 
+For bash, zsh, there's a [installation script](./.ci/install.sh)
+
 ```sh
-curl https://raw.githubusercontent.com/masan4444/phpup/master/.ci/install.sh | bash
+curl -fsSL https://phpup.vercel.app/install | bash
 ```
 
 #### Upgrade
 
 To prevent duplication in your shell config file, add `--skip-shell` option to install command.
 
 ```sh
-curl https://raw.githubusercontent.com/masan4444/phpup/master/.ci/install.sh  | bash -s -- --skip-shell
+curl -fsSL https://phpup.vercel.app/install  | bash -s -- --skip-shell
 ```
 
 #### Uninstall

vercel.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "https://openapi.vercel.sh/vercel.json",
+  "github": {
+    "silent": true
+  },
+  "redirects": [
+    { "source": "/", "destination": "https://github.com/masan4444/phpup" },
+    { "source": "/install", "destination": "https://raw.githubusercontent.com/masan4444/phpup/master/.ci/install.sh" }
+  ]
+}