Make performance-dashboards disconnected friendly

I am unsure if there was a specific design reason to put git cloning as a script into the [syncer container image](https://github.com/cloud-bulldozer/performance-dashboards/blob/master/dittybopper/templates/dittybopper.yaml.template#L69) however this makes performance-dashboards incompatible with environments that can not reach github.com. Could we put the templates directly into the container image or git clone but fallback to templates in the image instead of always trying to pull down the latest master branch?

Start with dittybopper/templates/dittybopper.yaml.template at the syncer container image definition and trace the script that clones templates from GitHub. Check how the image behaves when github.com is unreachable and determine how bundled templates or a fallback should be selected. Done means performance-dashboards can start in a disconnected environment without requiring access to GitHub.

Written by the indexing model from the issue text.