Add assets to docker image like mermaid.min.js

[peaceiris]

It is useful that the following assets are pre-installed into the docker image.

• mdbook-admonish.css
• mermaid-init.js
• mermaid.min.js

[cusma]

It is useful that the following assets are pre-installed into the docker image.

• mdbook-admonish.css
• mermaid-init.js
• mermaid.min.js

This is actually the best approach!

[cusma]

Hi @peaceiris! Is there any update on this? Are you still considering doing this?