Add additional skill storage paths for copilot

[jarle]

Updated paths for project and personal skills in documentation. copilot-cli successfully reads skills from these locations.

Why:

Closes: #43418

What's being changed (if available, include any code snippets, screenshots, or gifs):

I am adding documentation for the following paths where copilot-cli reads skills from:

• ~/agents/skills/
• ./agents/skill (in agent working directory)

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

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Source	Review	Production	What Changed
copilot/concepts/agents/about-agent-skills.md	fpt ghec	fpt ghec

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Copilot]

Pull request overview

Updates the “About agent skills” concept doc to include .agents/skills locations when describing where agent skills can be stored.

Changes:

• Adds .agents/skills as an additional supported project skill directory.
• Adds ~/.agents/skills as an additional supported personal skill directory.

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[chosen67one-source]

Skill

[chosen67one-source]

Skill