Move merged AZ-104 guide to study_with_ai and remove temporary file

[securegns]

Motivation

• Consolidate the merged AZ-104 networking guide into a single canonical location at study_with_ai/az-104.md to avoid duplicate copies and improve discoverability.
• Remove the temporary merged file left at the repository root and ensure there are no leftover module files under notes/az-104/ so the repo structure is tidy.

Description

• Placed the consolidated AZ-104 guide at study_with_ai/az-104.md containing the full merged content, module index, labs, and quick references.
• Deleted the temporary file Configure and Manage Virtual Networks .md from the repository root to prevent duplication.
• Checked for files under notes/az-104/ and found none to remove, so no additional deletions were necessary.
• Ensured the retained study_with_ai/az-104.md is the authoritative, single-file study guide for the AZ-104 networking content.

Testing

• No automated tests were executed.

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Codex Task