Allow liquid in mardkwon code blocks

Because I write about eleventy in the eleventy blog itself, I want to unescape code blocks, so they are not interpreted as liquid itself:

I can {{ write }} code here

The solution is to use { % raw % } and { % endraw % } (both without spaces)

• Source: https://megamorf.gitlab.io/2018/12/14/prevent-liquid-from-expanding-strings/
• Docs: https://shopify.github.io/liquid/tags/template/