Add i18n alternate locale links and meta tags

What's Changed

• feat: add support for alternate locale links and meta tags

Full Changelog: v.2.0.0...v2.1.0

v2.0.0

What's Changed

• feat: migration to Qv2 by @IlCallo in #11

Full Changelog: https://github.com/dreamonkey/quasar-app-extension-meta/commits/v2.0.0

Migration from v1

• change the name of APP_DOMAIN env variable to META_APP_DOMAIN
• replace all mixins with their new composable version (LayoutMetaMixin -> useLayoutSocialMeta, etc)