Add support for a Markdown analyzer for DeepSource. The issues detected by it can be on the lines of Markdownlint.
My workflow today is to run Markdownlint in VS Code, and use Markdownlint in my build process. But I suspect that errors and changes can get far more contextual if DS supports it 
This will also let me check for Markdown syntax and formatting issues and give me a better quality code for my blogs and docs repo.