docs(adk): create State and Configuration concept pages

[jacksonyzj]

Summary

Two new concept pages for State and Configuration, filling gaps in the ADK documentation.

Tickets

#	Ticket	Page
1	ADK-304	State
2	ADK-303	Configuration

State page covers

• Three state scopes: bot (global), user (per-user), conversation (per-conversation)
• Defining schemas in agent.config.ts and Conversation definitions
• Reading/writing state in handlers (clarified: only inside runtime context)
• Tags definition and read/write for bot, user, conversation
• State references with Reference.Workflow()
• bot.id and user.id identity accessors

Configuration page covers

• Full defineConfig reference with all options (including evals)
• configuration runtime import (read-only proxy)
• adk config / config:get / config:set with --prod flag (with real CLI output)
• Environment variables (process.env in agent.config.ts)
• Note: no dedicated secrets API; integration secrets via dashboard
• Note: adk config is separate from integration configuration
• Note: config:get reads persisted values only, not schema defaults
• Default models, custom events, dependencies

Test plan

• Preview via Mintlify staging deployment
• Live tested adk config, config:set, config:get on real bot
• Verified all internal links resolve

[mintlify]

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Project	Status	Preview	Updated (UTC)
botpress	🟢 Ready	View Preview	Apr 6, 2026, 2:49 PM

[adkah]

just a couple of comments in addition to those already left