Release v2.0.0

Performance:

• BREAKING: removed include of all styles by default. You now have to import the base styles AND the theme you want to use.
• Add will-change for transitioning toasts too.
• Added separate exports for composables.

Fix:

• Fixed toast might stay on screen if the duration is very low.

Chore:

• Fixed eslint issues.
• Updated dependencies.
• Updated demo app styling.
• Documented nuxt usage.