[feature] Add a "docs" section within the SFC files?

[HerrBertling]

While playing around with the components, I noticed that I'd sometimes like to add some additional documentation besides what is generated out of the box for the README.md, like so:

<docs>
## Documentation

This is a test
</docs>

Might also be useful if you want to expand this thing to using Vuepress, as outlined in #2 :)

Since I spiked this already on my local playground, I could open a PR if you're open to that?

[chrisvfritz]

Definitely open to a PR for this! Apologies for the very late response. I apparently wasn't watching this repo somehow, so wasn't receiving notifications.

[HerrBertling]

Might take a while, I'm currently busy with my latest and greatest release yet: 👶 😊