Simplify onboarding (automated, one-click, screencasts)

[woolfg]

• [ ] The onboarding process was automated so interested podcast hosts can use kind of a one-click integration (similar to podcastpage.io) to set up a test for their own podcast
• [ ] The documentation was extended by screencasts to simplify the onboarding process of podcast hosts

[woolfg]

create https://www.loom.com/share/765b9a034440401688bc778d8be7c2aa for chrome plugin for client onboarding