有一堆 deletePage

如果页面为src/pages/demo.js，则会在创建过程中删除该页面.

If you have a page src/pages/demo.js, this will delete that page during creation.

// gatsby-node.js
exports.onCreatePage = async ({ page, actions: { deletePage } }) => {
    if (page.path.match(/^\/demo/)) {
      deletePage(page)
    }
}