DataKlin docs

These guides cover DataKlin 0.3.0.

• Getting started: install DataKlin, connect to PostgreSQL and run your first query.
• Supported databases: PostgreSQL, MySQL and MariaDB, SQLite and Apache Cassandra: the versions DataKlin connects to, the connection form for each, and their limits in this release.
• Secret storage: how DataKlin protects the passwords and keys you save for a connection, and how to set up a keyring on Linux.
• TLS and certificates: encrypt PostgreSQL and MySQL connections and choose how DataKlin verifies the server.
• Read-only and production safety: read-only connections, confirmations before destructive statements, and production markers.
• Amazon Aurora and RDS: connect with AWS IAM authentication or AWS Secrets Manager over verified TLS.
• AWS credentials: profiles, IAM Identity Center (SSO), assumed roles, the default chain and access keys.