Clone Github Repository

git clone --recursive https://github.com/RetroPie/RetroPie-Docs.git

Update submodules:

cd RetroPie-Docs/retropie.wiki
git submodule update
git pull

Copy New Wiki to docs folder:

cd ..
rm docs/*.md
cp -r retropie.wiki/* docs/
cd docs/
mv Home.md index.md

Commit sources to master (if you wish)

git add .
git commit -m "submodule update"

Deploy Latest Changes:

cd RetroPie-Docs
mkdocs gh-deploy