Chord chart into your blog

• You can insert chord chart into your blog using fumen markdown language (https://hbjpn.github.io/fumen)
• Usage:

1. Insert "code" block from visual editor.
2. Put "!fumen" in the first line
3. Put fumen markdown code from 2nd line.

* Recommended to use visual editor, rather than classic editor, as special characters like square brackets etc needs to be replaced with character reference which is not convenient.