Refactoring

[afa-farkhod]

📝Summary:

• .gitignore update to exclude user-specific files, ansible related files, sample files, system editor files
• create playbooks directory and move main.yml and prometheus_config.yml playbook files inside to better organize the directory structure:

playbooks
|-- main.yml
`-- prometheus_config.yml

• update README.md to include new path of main.yml playbook file and add some tuning in to some variables
• create group_vars/all.yml: Moving port numbers from individual Ansible roles and tasks to a centralized group_vars/all.yml provides maintainability, reusability, and clarity
• assign variables instead of port numbers based on group_vars/all.yml, changed files:

roles/alert_manager/files/alertmanager.service
roles/grafana/files/grafana.nginx.conf
roles/loki/files/loki.yml
roles/prometheus/files/prometheus.nginx.conf
roles/prometheus/files/prometheus.yml
roles/promtail/files/promtail.yml

[afa-farkhod]

@husonghua Hi there, please have a look in the following PR, thanks 😊