I use Obsidian to write these notes, and Blot to publish them. I have a private git repo for all my notes public and private, and the notes that get published on this website are a submodule in that larger git repo (the submodule is the git repo blot provides for syncing).

I use the Obsidian Git plugin to automatically push content to the website, so when a file is edited or moved to the submodule, the plugin will push that content to the website at some interval.

I use Working Copy to sync the repo to a local folder on my iOS devices that the Obsidian mobile app can use as a vault.

Alternatives

Robustness

Pre-notes