Clarify and Align Documentation on GitLab CE and EE Usage - Gitlab Duo

Problem Statement

There seems to be a discrepancy in our documentation regarding the usage of GitLab Community Edition (CE) and Enterprise Edition (EE). The handbook page and blog post suggest that customers should adopt the CE edition with the unified codebase and that the EE repository is archived. However, the GitLab architecture overview still mentions CE and EE, which can lead to confusion while using Duo Chat

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Exit Criteria

1. Synchronize the information between the handbook page and the GitLab architecture overview to ensure they both accurately reflect the current status of CE and EE, including the archiving of the EE repository.

Follow-up Work

1. Follow-up work: Update GitLab Duo's search functionality to include the information from the handbook page when generating a description of EE and CE.