Update docs structure when DR-008-infra solution is implemented

[ryan-steel]

Description

The current implementation uses source_dir = "." with conf.py and index.rst at the repo root as a workaround based on DR-008-infra. When the infrastructure team implements the proper solution for including component documentation, we should update to use that canonical approach.

Context

• Current workaround: source_dir = "." with conf.py/index.rst at root and include_patterns filtering
• Blocked by: Infrastructure team implementation of DR-008-infra solution
• Related PR: Add user manuals for time module #133

Acceptance Criteria

• Monitor DR-008-infra for infrastructure team solution
• Update docs structure to use the canonical approach for including component docs
• Move conf.py and index.rst back to docs/ if possible
• Update BUILD configuration accordingly

Blocked By

Infrastructure team implementation of DR-008-infra - see eclipse-score/docs-as-code#554

[AlexanderLanin]

@ryan-steel please note that the blocked by issue is now resolved. Ping me in slack for support!