What's next sections in every lab

So far, we have a [general section](https://superluminar-io.github.io/serverless-workshop/#/next) with ideas of how to continue with AWS. Instead of having just one large list, we could split it up and provide a What's next section in every lab.

Acceptance criteria:
- [ ] Get rid of the current general section
- [ ] What's next sections in lab if applicable 