Let's finish creating a Site! (and also finish the YouTube importer)

3 January 2021

Let's finish creating a Site! (and also finish the YouTube importer). It was very exciting to get YouTube videos stored in the app last week and we left a few things unfinished as part of that work, so we'll go and do a quick tidy up. However I really want to get the end-to-end process of creating a `Site` finished so we'll look at doing that too.