Remove duplicate command authoring documentation

[Copilot]

Two documentation files existed for adding azd commands: new-azd-command.md (1,325 lines, comprehensive) and adding-command.md (211 lines, basic subset).

Changes

• Removed cli/azd/docs/style-guidelines/adding-command.md
  • All content covered by new-azd-command.md with greater depth
  • No references found in codebase (grep across .md, .go, .yaml, .yml)
  • Newer file includes complete examples, IoC patterns, and output formatting guidance absent from older doc

Single source of truth now: docs/style-guidelines/new-azd-command.md

Original prompt

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This section details on the original issue you should resolve

<issue_title>Tidy duplicate files</issue_title>
<issue_description>We have two docs that are guidance on adding a new command:

• Primary doc: /main/cli/azd/docs/style-guidelines/new-azd-command.md

• Older secondary doc: /main/cli/azd/docs/style-guidelines/adding-command.md

• Please check if there is anything that is in the older doc that needs to be pulled into the primary doc that is more current/recent.

• Check throughout the codebase to see if the secondary file is mentioned, and if so update the pointer reference to the most current doc on adding a new command.

• After you've completed the first two tasks, then delete the second file.
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Tidy duplicate files #6643

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[Copilot]

Pull request overview

Removes a redundant documentation file for authoring azd commands so there is a single, comprehensive source of guidance (new-azd-command.md).

Changes:

• Deleted cli/azd/docs/style-guidelines/adding-command.md (older, subset documentation).
• Confirmed there are no remaining references to adding-command.md in the repository (searched across common doc/code/config extensions).

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[rajeshkamal5050]

/check-enforcer override