Respect NO_COLOR in Markdown output

src/libcmd/markdown.cc

@@ -44,7 +44,7 @@ std::string renderMarkdownToTerminal(std::string_view markdown)
     if (!rndr_res)
         throw Error("allocation error while rendering Markdown");
 
-    return std::string(buf->data, buf->size);
+    return filterANSIEscapes(std::string(buf->data, buf->size), !shouldANSI());
 }
 
 }