For one-off HTML exports, found the plugin KosmosisDire/obsidian-webpage-export: Export html from single files, canvas pages, or whole vaults. Direct access to the exported HTML files allows you to publish your digital garden anywhere. Focuses on flexibility, features, and style parity.

It exports both the vault and individual pages, and adds things like toc on the left and toggles and optionally file browsing. Much better than the other pandoc-based export plugin that I could not get to work reliably for exporting good-looking HTML