Added refactored portions to make code more manageable and readable

[Alig1493]

• using depends on instead of links to ensure the db service starts up first
• persisting db volumstoragees with an external volume
• moving requirements to a separate folder

[Alig1493]

@banjtheman I was hoping to propose these refactors to your work if possible. I think this will help make the code more manageable.

[banjtheman]

not needed atm