Update astrodb_bot documentation

[kelle]

• Don't use Plan mode - use Manual or Auto. The Directions/instructions basically mimic Plan mode.
• Use LOW effort - prompts more questions, less assumptions.
• Chicken and egg problem: Installation instructions assume that user has already cloned the template database. https://astrodb-utils.readthedocs.io/en/stable/pages/db_management/agent_skills.html