refactor: examples for js-ipfs 0.41 (#270)

* refactor: examples for js-ipfs 0.41

This also removes the `react-live` preview component that uses `buble`.

`buble` does not support `for await...of` loops. Instead we just run the code (in the same way that `react-live` does) without the transpile.

* fix: promisify error

* chore: update ipfs dep and remove promisify shim

* chore: old aegir is old

Author: Alan Shaw