Fixes issue #12

[IsaacSteadman]

• Address #12
• refactor the common flow of user authentication into getUserDataBufferV2
• split up server/routes/helpers.ts into multiple files under server/utils/* with server/utils/index.ts serving as a single module to import all the utils
  • this is useful when debugging a user from the node REPL as you only need to import one module to import all the utils needed to read a user
• update README
• attempt fix form leaking password when javascript fails to load and user tries to log in
• add function to get or compute the value that would be copied if the copy button was clicked