Decide what to do with the `api.spacex.com` data dependency

The REST calls to api.spacex.com [recently broke](https://github.com/apollographql/fullstack-tutorial/issues/288). It would be nice to make the tutorial work without api.spacex.com

Currently the tutorial is not using the API (the list of launches is static and will not reflect new launches). We might want to rework that part to either use another endpoint or investigate with Cloudflare what's wrong.

首先追踪 tutorial 对 api.spacex.com 的 REST 调用，并阅读关于所报告故障的 issue #288。完成的标准是在恢复可用的动态发射源与保留可靠的静态或替代源之间作出决定，并确保 tutorial 在不依赖已损坏依赖项的情况下正常运行。

由索引模型根据 Issue 内容生成。