feat(config) add withGlobalTauri conf description (tauri-apps#82)

Author: lucasfernog

docs/api/config.md

@@ -22,15 +22,17 @@ It's composed of the following properties:
 </div>`},
 {property: "devPath", type: "string", description: `Can be a path—either absolute or relative—to a folder or a URL (like a live reload server).`},
 {property: "beforeDevCommand", optional: true, type: "string", description: `A command to run before starting Tauri in dev mode.`},
-{property: "beforeBuildCommand", optional: true, type: "string", description: `A command to run before starting Tauri in build mode.`}
+{property: "beforeBuildCommand", optional: true, type: "string", description: `A command to run before starting Tauri in build mode.`},
+{property: "withGlobalTauri", optional: true, type: "boolean", description: "Enables the API injection to the window.__TAURI__ object. Useful if you're using Vanilla JS instead of importing the API using Rollup or Webpack."}
 ]}/>
 
 ```js title=Example
 "build": {
   "distDir": "../dist",
   "devPath": "http://localhost:4000",
   "beforeDevCommand": "npm run dev",
-  "beforeBuildCommand": "npm run build"
+  "beforeBuildCommand": "npm run build",
+  "withGlobalTauri": false
 }
 ```
 

docs/api/js.md

@@ -24,6 +24,7 @@ npm install tauri --save
   ```js
     window.__TAURI__.dialog.open()
   ```
+  To enable it, set `tauri.conf.json > build > withGlobalTauri` to `true`.
 </Alert>
 
 ## Tauri