DDEV Deeper integration with Platform.sh and other upstreams

DDEV has long had "pull" integration with Pantheon, Platform.sh, and Acquia Cloud, but one outcome of Platform's sponsorship of the project is improved Platform.sh integration. You can now use the (WIP) ddev-get add-on (`ddev get platformsh/platformsh-ddev`) to get the configuration of your upstream project and have it replicated in your DDEV environment.

I'll demo this, and we can take a look at other projects (even yours) and see how it works for you.

We can also talk about the existing pull integrations with other sources (Pantheon, Acquia, rsync, git, you-roll-it, etc)