3.0.0

• Added Ghost 6 support.
• Added error.hbs and error-404.hbs templates.
• Added a footer copyright text custom setting.
• Added support for additional Ghost social profile links in the footer.
• Added mobile menu behavior.
• Added minified CSS and JS assets.
• Reworked the base layout so templates share a common main content wrapper.
• Refreshed post, page, index, tag, author, comments, footer, header, loop, and pagination markup.
• Improved accessibility.
• Updated English and Brazilian Portuguese locale files.
• Updated README documentation.
• Removed Disqus comment support and related custom settings.
• Removed unused social icon partials.