Split admin settings into multiple sub pages

Problem to solve

The Admin Area Settings section currently contains a huge list of more than 36 settings sections. We should break up the settings into multiple sub pages to make it more digestable.

Proposal

General

• Visibility and access controls
• Account and limit settings
• Sign-up restrictions
• Sign-in restrictions
• Web terminal

Integrations

• Elasticsearch
• Elasticsearch AWS IAM credentials
• PlantUML
• Slack application

Repository

• Repository mirror settings
• Repository storage
• Repository maintenance

CI/CD

• Continuous Integration and Deployment

Reporting

• Spam and Anti-bot Protection
• Abuse reports
• Error Reporting and Logging

Metrics and profiling

• Metrics - Influx
• Metrics - Prometheus
• Profiling - Performance Bar
• Usage statistics

Network

• Performance optimization
• User and IP Rate Limits
• Outbound requests

Preferences

• Email
• Help page
• Pages
• Real-time features
• Background Jobs
• Gitaly Timeouts

Mockup