[Parent] 0.19.0 Release content for blog, social media and slack

[stichbury]

What we need for the blog and/or social media and Slack channels:

• Migration guide documentation for migration to the breaking release (content created for Create migration content for users updating their Kedro version kedro#1887 such as a migration guide in the release notes). <-- covered separately as a docs ticket
• Blog post about "What's new in 0.19.0" which will cover how to migrate at high level (pointing to further info) plus high level features <--to publish on 15/01/24
• Blog post specifically about add-on flow in 0.19, since this is a big change. Tracked by Create a blog post about add-ons as part of 0.19.0 release announcements #116

We will also need a range of graphics (built using the marketing template) and QR codes.

Not yet considered: Will there be any website content updates?

[stichbury]

I think this is done as there are other tickets tracking the separate activities above. Closing.