Helm charts repository is nothing but bunch of zip files served by a server. Its mostly static data. Follow below steps at root directory, and get your PR merged. Make sure that you bump up chart versions also.
Following: https://docs.helm.sh/developing_charts/#hosting-chart-repositories
NOTE: Bump up chart versions in Chart.yaml before proceeding.
# First create zip files for charts
cd /path/to/cloned/repo/of/helm-charts
helm package dockup
helm package db-pool
helm package agent
# Now move generated packages to docs folder
mv dockup-*.tgz docs
mv db-pool-*.tgz docs
mv agent-*.tgz docs
# Update index file in docs folder
cd docs
helm repo index --url=https://helm-charts.getdockup.com .
Now commit changes, open a PR and get it merged. Ensure that you change version of charts before publishing.