Title support

Hello, thank you for this great plugin!

One thing I noticed when using it that can be improved. Some articles may have citations or bibliography, others not. Usually, before either of blocks you want to have some title, like “Article Sources”.

Now, we can only add heading before the citations block ourselves. And it would not reflect the presence or absence of the actual citations block on the page. Adding

If you add a title field that will be only displayed with the citation block, will be great.

Thank you.