Refactor file paths

[delta6862]

Is your feature request related to a problem? Please describe.
Currently the docker-compose volume mapping looks like

    volumes:
      - ./data/pages:/webapp/pages:ro
      - ./data/writeups:/webapp/writeups
      - ./data/db:/webapp/db
      - ./data/challenges/:/tmp/challenges:ro
      - ./data/.git-credentials:/root/.git-credentials:ro
      - ./webapp/templates/:/webapp/templates:ro
      - ./webapp/static/:/webapp/static
      - ./data/config.json:/webapp/config.json:ro

With the exception of .git-credentials these paths don't need to be remapped (/data/config.json can be mapped to /webapp/data/config.json in the docker container, instead of the current /webapp/config.json)

Describe the solution you'd like
Ideally we mirror the folder structure in and outside of the docker container. Making development and testing easier. There are a few edge cases revolving around git that we need to consider. Like the git-credentials and docker escapes through git hooks (https://book.hacktricks.xyz/linux-hardening/privilege-escalation/write-to-root).

Describe alternatives you've considered
This is not a high priority change, as the intended way of running pwncrates is through docker-compose. But it simplifies the folder mapping, which in my eyes is a good thing.