Review outdated and unneeded project dependencies

[internetisaiah]

Issue description

Run yarn outdated to review outdated and unneeded project dependencies found in package.json and yarn.lock.

Tasks:

• [ ] Replace gulp-vinyl-zip@2.5.0. Impacts @antora/file-publisher and @antora/ui-loader in @antora/site-generator.
• [ ] Upgrade @mermaid-js/mermaid-cli.
• [ ] Remove mermaid.cli@0.5.1. @mermaid-js/mermaid-cli can be used instead.
• [ ] Either upgrade or remove @sntke/antora-mermaid-extension, depending if same functionality is built in to @mermaid-js/mermaid-cli.
• [ ] Either upgrade or remove mermaid, depending if same functionality is built in to @mermaid-js/mermaid-cli.