convert to markdown and sync with english version for WebAssembly

[yin1999]

This document does has any heading element, so the BCD is shown in wrong place. Fixes this by add heading element.

But I'm not very familiar with traditional Chinese, so I haven't translated the API 參考 section. Help wanted on this section.

[github-actions]

Preview URLs

• https://pr5501.content.dev.mdn.mozit.cloud/zh-TW/docs/WebAssembly

Flaws

URL: /zh-TW/docs/WebAssembly
Title: WebAssembly
on GitHub
Flaw count: 33

• macros:
  • /zh-TW/docs/Web/JavaScript/Reference/WebAssembly does not exist
  • /zh-TW/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module does not exist but fell back to /en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module
  • /zh-TW/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Global does not exist but fell back to /en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Global
  • /zh-TW/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Instance does not exist but fell back to /en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Instance
  • /zh-TW/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Memory does not exist but fell back to /en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Memory
  • and 15 more flaws omitted
• broken_links:
  • Can use the English (en-US) link as a fallback
  • Can use the English (en-US) link as a fallback
  • Can use the English (en-US) link as a fallback
  • Can use the English (en-US) link as a fallback
  • Can use the English (en-US) link as a fallback
  • and 8 more flaws omitted

External URLs

URL: /zh-TW/docs/WebAssembly
Title: WebAssembly
on GitHub

• https://emscripten.org/ (1 time) (Note! This may be a new URL 👀)
• https://github.com/JasonWeathersby/WASMSobel (1 time) (Note! This may be a new URL 👀)
• https://hacks.mozilla.org/category/webassembly/ (1 time) (Note! This may be a new URL 👀)
• https://research.mozilla.org/ (1 time) (Note! This may be a new URL 👀)
• https://web.dev/emscripting-a-c-library/ (1 time) (Note! This may be a new URL 👀)
• https://webassembly.org/ (1 time) (Note! This may be a new URL 👀)
• https://www.w3.org/community/webassembly/ (2 times) (Note! This may be a new URL 👀)
• https://www.w3.org/wasm/ (1 time) (Note! This may be a new URL 👀)

[irvin]

But I'm not very familiar with traditional Chinese, so I haven't translated the API 參考 section. Help wanted on this section.

it's ok to leave it for other people to fix in future