Need codeblock highlighting for non imba code.

Need code blocks for non imba code such as commandline code. it seems that everything has imba highlighting at the moment.

```
git clone https://github.com/imba/template my-app
```

Reproduce the fenced `git clone` example on the Imba website and locate the code-block rendering entry point. Check how language information is assigned to fenced blocks; done means non-Imba examples receive appropriate highlighting while Imba code keeps its existing highlighting.

Written by the indexing model from the issue text.