Mermaid - Add securityLevel loose to open links in a new tab

[rodrcastro]

New links can be opened in a new tab based on the Mermaid documentation. This requires the security level to be set to loose.

This PR adds the security level loose to allow for links to be opened in a new tab.

[changeset-bot]

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Latest commit: 0c39f66

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[taranvohra]

Hm, it's a bit risky because securityLevel: 'loose' can allow JS callbacks to be executed which makes it prone to XSS attacks. I am not really sure if we should offer it as a default behaviour. @SamyPesse any thoughts?

[addisonschultz]

PR related to issue logged: #240