Hi,

It would be nice if when displaying Markdown READMEs in the repository overview, users can disable syntax highlighting altogether for code blocks.

I've been trying to find a way to do this to no avail in the following Bitbucket documentation.
https://confluence.atlassian.com/display/BITBUCKET/Display+README+text+on+the+overview

I only need something really simple like the following example. In the example, the flag lang-none forces no syntax highlighting.

Contents of README.md

```lang-none
$ even though this looks like a shell session due to the dollar signs
$ do not try to guess the language or perform any syntax highlighting
```