Reorganize `transactions/` directory so there is a consistent organization

[joshuahannan]

Issue To Be Solved

Right now, we have a sub-directory in transactions/ for each of the important contracts, but each contract's directory is organized slightly differently. We like to propose a system for organizing all of them and make those changes.

Please tag @joshuahannan here if you'd like some guidance on how to complete this! 😃

Suggest A Solution

• Propose a directory structure here
• Decide on the structure
• Move the transactions to their correct places in the directory
• Update the templates package to use the correct paths for all the transactions and scripts
• Update the flow docs at onflow/flow to link to the correct transactions