This standardises all my markdown files to have no leading newline after the `---` that ends the frontmatter.
This makes display on Gemini (in which newlines matter) much more consistent!
I can't spot any errors with the regex I used here, but there may be one or two articles that change shape — hopefully I can spot them and fix them!
I'm going through cheking to see how much I can do a bulk-import. I'm thinking I'll have to read through these and add them in tranches — as there's lots of nonsence in there!
