v2.0.0: Svelte 5 support

• Rename Sverto to quarto-svelte
  • Breaking: filters: ["sverto"] is now filters: ["quarto-svelte"]
  • Breaking: sverto.use is now quarto-svelte.use
  • Repo name is now jimjam-slam/quarto-svelte, but jimjam-slam/sverto will continue to work
• Upgrade from Svelte 3 to Svelte 5
  • For notes on rewriting existing Svelte components for Svelte 5, see the Svelte 5 Migration Guide
• Now uses web components
  • Breaking: in addition to general Svelte 5 migration, components for quarto-svelte need to have a custom element option
  • Breaking: old instantiation syntax no longer works in Svelte 5. Instead, use an HTML template or JavaScript to create an element with the custom element name