Adding Cobra CLI to project #2

I would like to have a composable cli tool with subcommands for management of the Flux Feed application. This PR restructures the cmd package according to conventions outlined in the Cobra user guide https://github.com/spf13/cobra/blob/main/site/content/user_guide.md

At present only the database migrate command is implemented, and with minimal functionality. Future work will have to add additional flags and information on how to declare the location of the database to be migrated.

I would like to have a composable cli tool with subcommands for management of the Flux Feed application. This PR restructures the cmd package according to conventions outlined in the Cobra user guide https://github.com/spf13/cobra/blob/main/site/content/user_guide.md At present only the database migrate command is implemented, and with minimal functionality. Future work will have to add additional flags and information on how to declare the location of the database to be migrated.

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Adding Cobra CLI to project #2