The site http://yacd.haishan.me is served with HTTP not HTTPS is because many browsers block requests to HTTP resources from a HTTPS website. If you think it's not safe, you could just download the zip of the gh-pages, unzip and open or serve index.html directly.
Docker image is also available as haishanh/yacd.
# install dependencies
yarn
# start the dev server
# then go to http://127.0.0.1:3000
yarn start
# build optimized assets
# ready to deploy assets will be in the directory `public`
yarn build