Lazy Load Pagination #191

<!-- Please don't delete this template or we'll close your issue -->

<!-- Before creating an issue please make sure you are using the latest version of Saber. -->

Feature request

Currently, pagination for saber-plugin-query-posts is done by creating multiple static pages, each with different posts. It is not possible to only have one blog post page that loads more posts when you scroll to the bottom (or click a button, whatever).

<!-- Please ask questions via following several ways. -->

<!-- https://chat.saber.land/ -->

<!-- https://stackoverflow.com/questions/ask?tags=saberjs -->

What does the proposed API look like?

// Index.vue

async loadMorePosts() {
  this.currentPage++;
  const loadedPosts = await this.page.posts.loadPosts(this.currentPage);
  this.posts.push(loadedPosts);
}

How should this be implemented in your opinion?

By generating paginated json files that the client can request when needed.

Are you willing to work on this yourself?

Yes.