chore(deps): update dependency @unhead/vue to v3 - #1469

Changed pages include:

• index.html - view
• 200.html - view
• 404.html - view
• community/changelog.html - view
• community/credits.html - view
• getting-started/configuration.html - view
• getting-started/installation.html - view
• getting-started/live-content.html - view
• getting-started/typegen.html - view
• getting-started/usage.html - view

There are more changes not included in the list