Update Onboarding Processes in Readmes.

[MikeyManoguerra]

Try spinning the project up from scratch using both the main readme and the front end readme.

• clarify and update as necessary

For the frontend Readme, there is definitely a bug

the on-boarding process should prompt running

• script/server (getting all three docker containers built)
• script/update (seed the db and such)
• yarn dev run the dev server for HMR

Update the readmes, then test/double check for accuracy.
add clarifying steps if necessary