scripts: Re-scope init-db.sh, add orchestrator.sh

Added:

• (Dockerfile) Add $APP_NAME prefix to scripts
• (orchestrator.sh) Orchestrator for StudySphere application

Changed:

• (Dockerfile) Move scripts to /usr/local/bin
• (Dockerfile) Clean up comments
• (Dockerfile) Replace RUN command with orchestrator
• (init-db.sh) Moved orchestration-esque code to orchestrator

Removed:

• (init-db.sh) Remove auxiliary functions (to be added back later)