Use aka.ms/apm-unix and aka.ms/apm-windows short URLs for install scripts

[Copilot]

Description

Replace raw.githubusercontent.com/microsoft/apm/main/install.{sh,ps1} URLs with aka.ms/apm-unix and aka.ms/apm-windows across README, docs, CLI output, and install script.

Shorter, memorable, and Microsoft-branded.

Before:

curl -sSL https://raw.githubusercontent.com/microsoft/apm/main/install.sh | sh
irm https://raw.githubusercontent.com/microsoft/apm/main/install.ps1 | iex

After:

curl -sSL https://aka.ms/apm-unix | sh
irm https://aka.ms/apm-windows | iex

• README.md — both platform install commands
• 6 doc pages — installation, quick-start, index, ci-cd, runtime-compat, cli-reference
• update.py — _get_update_installer_url() and _get_manual_update_command() now use aka.ms
• install.sh — usage comment updated; private-repo auth examples intentionally kept on raw URL (auth headers don't survive redirects)
• CHANGELOG.md — entry under Unreleased

Type of change

• Bug fix
• New feature
• Documentation
• Maintenance / refactor

Testing

• Tested locally
• All existing tests pass
• Added tests for new functionality (if applicable)

Updated test_update_command.py assertions to match new URLs. All 3 update command tests pass.

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[Copilot]

Pull request overview

Updates APM installation and update references to use the shorter aka.ms/apm-unix and aka.ms/apm-windows URLs across the CLI, installer script comment, and documentation, so users see consistent, memorable install commands.

Changes:

• Switch apm update installer URL + manual update instructions to aka.ms/apm-unix / aka.ms/apm-windows, and update unit tests accordingly.
• Replace raw.githubusercontent.com/.../install.{sh,ps1} with the aka.ms short URLs across docs pages and README snippets.
• Add a CHANGELOG entry describing the install URL change under Unreleased.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/apm_cli/commands/update.py	Uses aka.ms short URLs for updater download + manual update command output.
tests/unit/test_update_command.py	Updates assertions to match the new updater URLs.
install.sh	Updates the usage comment to the new aka.ms install URL.
docs/src/content/docs/reference/cli-commands.md	Updates manual update docs to the new aka.ms URLs.
docs/src/content/docs/integrations/runtime-compatibility.md	Updates install snippet to the new Unix aka.ms URL.
docs/src/content/docs/integrations/ci-cd.md	Updates CI install snippet to the new Unix aka.ms URL.
docs/src/content/docs/index.mdx	Updates homepage install snippets to the new aka.ms URLs.
docs/src/content/docs/getting-started/quick-start.md	Updates quick-start install snippets to the new aka.ms URLs.
docs/src/content/docs/getting-started/installation.md	Updates installation page snippets to the new aka.ms URLs.
README.md	Updates README install snippets to the new aka.ms URLs.
CHANGELOG.md	Adds an Unreleased entry for the install URL change.