Optionally allow to use Mermaid graphs from external file
Optionally allow to use Mermaid graphs from external file

If the Mermaid block has an argument, it's used as the relative path to the file whose content will be rendered instead of the content of block, similar to how html script tags work. This implements issue #7.
JozoVilcek/gitbook-plugin-mermaid,piranna/gitbook-plugin-mermaid,piranna/gitbook-plugin-plotly,piranna/gitbook-plugin-mermaid,JozoVilcek/gitbook-plugin-mermaid,piranna/gitbook-plugin-plotly