This is not a simple process.
You can try this methods but you may need to do some manual changes.
If you want to update your documentation to latest version, you can run
python3 okf_collab_docs/run.py update-from-template
If you accept changes, you'll need to run:
git push -f origin main
You can also do it manually by running
git remote add upstream [email protected]:okfn/okfn-collaborative-docs.git
git fetch upstream
git rebase -Xours upstream/main main
git push -f origin main