Ever since I switched to a predominantly iPad-based workflow I have found writing for and updating information on this website to be incredibly simple. Since I use the JAM Stack with Hugo, Github and Netlify (see below) the app I use to sync for git is the excellent Working Copy. This maintains repos locally on the iOS Files app.
I write almost exclusively on iA Writer on iPad which updates markdown files directly in the iOS Files app, which means it updates my local repo directly with no fuss. A combination of iA Writer and Working Copy means no duplication and perfect synchronisation.
Some files are hosted on Google Drive (I quit Dropbox after their unreasonable price hike) rather than in my repo, and this too can be managed straight via the Drive app on iPad or, sometimes, the iOS Files app.