Fix CivicSignal Research blog Live-previews

**Describe the bug**
Currently live-previews are not working for components that require pre-processing on `getServerSideProps`. We need to find a proper way to fix this issue. Two proposed solutions are:

1. Refractor the [blockify](https://github.com/CodeForAfrica/ui/blob/main/apps/civicsignalblog/src/lib/data/blockify/index.js) to make it callable on both client-side and server-side.

2. Use payload's [afterRead](https://payloadcms.com/docs/hooks/collections#afterread) hook to handle all the data transformation i.e. move the call of the blockify function in this hook .