fix(mermaid): TD intro graph (tauri-apps#37)

Author: nothingismagick

website/docs/getting-started/intro.md

@@ -13,10 +13,11 @@ If you find an error or something unclear, or would like to propose an improveme
 2. Visit our [Discord server](https://discord.gg/SpmNs4S) and raise your concern.<br />
 3. Request to join the education working group on Discord to gain access to its discussion channel.
 
-<Introduction />
+## How Tauri Works
 
-## How It Works
+<Introduction />
 
+### Flow
 1. Create your web app with your frontend framework of choice and bundle it into HTML/CSS/JS.
 2. The Tauri.js CLI takes it and rigs the underlying native code according to your configuration.
 3. In dev mode it creates a webview window with debugging and hot-module-reloading.

website/src/theme/Introduction.js

@@ -3,7 +3,7 @@ import React from 'react'
 
 export default () => {
   const chart = `
-  graph LR
+  graph TD
       U-->JS
       JS-->B
       B-->BUILD