WordPress uses a quirky subdirectory structure where it groups posts by year and then by month, which I don't particularly like, but I needed a way to have my old posts be placed in the same subdirectories in order for old links to work. I wrote some code to check that all image tags use relative links (no linking to external images) and that all image files referenced actually exist. Two other simple automated check that I added is to make sure that drafts aren't included in the deployment, and to make sure that I don't directly link to index.html to try and futureproof things in case I ever wanted to move away from a fully static website.