Add scripts and docs to configure docker backups

[perpetrator1]

Proposed Changes

• Added a script for backing up the PSQL database in the docker container
• Added docs to set up the cronjob in README.md
• Edited the compose file to mount a local directory to new directory inside the container
• Added docs to restore the container's database
• Fixed some typos

Associated Issue

• https://github.com/ohcnetwork/care/issues/2301
• The backup script works perfectly
• Mounted a local directory to a new directory(backups) inside the container, so that the user can move the backed up sql file inside this local directory and restore the container's database
• The backup.md doc will help the user to restore the container's database

Architecture changes

• Added a new doc
• Added a new script in /care/scripts Only PR's with test cases included and passing lint and test pipelines will be reviewed

@ohcnetwork/care-backend-maintainers @ohcnetwork/care-backend-admins