Add full demo data steps to documentation, clean up vars, fix dispatch bug, add version range for tuva_project package

[sarah-tuva]

Describe your changes

• Updated the README with steps on how to run the project with full demo data from the Snowflake Marketplace
• Cleaned up the vars in the dbt_project.yml
• Fixed a bug with the dispatch override
• Added a version range for the tuva_project package

How has this been tested?

This has been tested in my dev_sarah database in Snowflake.

Reviewer focus

Please help look for typos and clarity in the README instructions.

Checklist before requesting a review

• [x] I have recorded a Loom performing a self-review of my code
• [x] My code follows style guidelines
• [x] I have commented my code as necessary
• [x] I have tested my code by running dbt build in the following warehouse(s):
  • [x] Snowflake
  • [ ] Redshift
• [ ] I have implemented generic dbt tests to validate primary keys/uniqueness in my model
• [ ] I have updated dbt docs by running dbt docs generate and copying the appropriate files to the docs/ path
• [x] I have added at least one Github label to this PR

(Optional) Gif of how this PR makes you feel

Loom link

https://www.loom.com/share/0de6433b3ed148e4947b7107f5abb8c6

For reviewers

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[sarah-tuva]

Running the Project with Full Demo Data

Thanks @bentuvan! I went back and forth on this one.