Redesign landing page with switch for demo / first time installation. Default to first time installation.

[Lomilar]

After CaSS gets installed, typical desires are one of the following:

• Get my data in there.
• Get some data in there that I can build a profile with.

Then:

• Get my profile in there.
• View some default profile.

With the eventual goal often being either:

• Hook CaSS up to another system.
• Invite others to collaborate.

Some sort of first time "Generate / import default data" cheat screen could help with that where we can import known frameworks and generate some random self-assertion data against it.