Add a News feed

We have relevant information about CloudNativePG that we never reflect in the website.
I think it would be cool to have a Twitter-like feed of short snippets with links.
Many of these things cannot/should not have a dedicated blog article in the CNPG website.

Example of news snippets:
- Links to talks given at Kubecon or other venues
- New tutorials published by Gabriele in his personal site
- Links to articles or videos with operator comparisons etc.
- Upcoming things, e.g. presence at Kubecon