Rename Tuva Claims Demo project

[sarah-tuva]

Rename the Tuva Claims Demo name and project to the_tuva_project_demo and remove unnecessary models.

• Rename the Tuva Claims Demo repo
• Rename the dbt project
• Change the schema for seeds back to raw_data.
• Remove the models and rename the seed files to the model names by dropping the "_sample" part.
• Update the README
• Update marketplace listings once repo is renamed

[sarah-tuva]

@aneiderhiser How do you feel about setting the schema to tuva_synthetic instead of raw_data? I'm thinking this is more descriptive and may help if someone runs the demo in a database with other schemas in their environment. This demo project will build in the database listed in their dbt profile they're running it with.