Change aggregation and remove SQLite from ETL pipeline

[jeremiak]

Hope to close out #18 when this gets merged. This PR:

• removes the SQLite database from the process because it seemed to just add complexity
• slightly changes the way the aggregated data is stored to keep track of the filing committees for better auditing
• updates the sveltekit code to handle the change in the data structure

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[jeremiak]

Cool, I agree that it's best to keep them separate for now (especially since they're pretty small functions) so that the amount of stuff a developer needs in their head when they make changes is minimized. At least until we have much higher/better test coverage. Which shouldn't be hard, we currently have 0% coverage.