Documentation: Add docs for .continue/configs directory support

[continue]

Summary

PR #11935 added .continue/configs/ as a third directory (alongside .continue/agents/ and .continue/assistants/) for loading local config profiles. This feature allows users to place YAML config files in .continue/configs/ to create additional local configuration profiles.

Documentation Needed

• Update the configuration documentation to mention that .continue/configs/ is a valid location for local config profiles
• Explain how files in .continue/configs/ are automatically discovered, watched, and loaded as local profiles
• Document the relationship between the three directories: .continue/agents/, .continue/assistants/, and .continue/configs/

Files to Update

• docs/customize/deep-dives/configuration.mdx
• docs/guides/understanding-configs.mdx
• Possibly create a dedicated page for local profile directories

Related PR

• feat: add .continue/configs support #11935: feat: add .continue/configs support

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Co-Authored-By: Continue noreply@continue.dev
Co-authored-by: bekahhw rhawrot@gmail.com