docs(aws): migrate /aws/customization and remaining /aws/services pages to use lstk

[peter-smith-phd]

Migrates the Customization (/aws/customization) and Local AWS Services (/aws/services) sections to lstk, following on from #789, #792 and #800.

Types of changes

• Command conversion — awslocal → lstk aws, and localstack <cmd> → the lstk equivalent (lstk start, lstk logs, lstk volume path).
• Config conversion — env-var-and-flag invocations (DOCKER_FLAGS, IMAGE_NAME, LOCALSTACK_VOLUME_DIR, --host-dns, --network) become .lstk/config.toml container blocks (volumes, image, volume, expose_ports, [env.*] profiles).
• Tab restructuring — <TabItem label="LocalStack CLI"> blocks are either converted to lstk tabs or dropped where lstk has no equivalent, leaving docker-compose as the only form.
• "Not yet supported" notices — where a page depends on behaviour lstk does not have, the page keeps the legacy localstack CLI (or plain docker run) and now says so explicitly. We will address these gaps post-launch.
• Incidental fixes picked up along the way — broken upstream links in aspire.md, GitHub Discussions links replaced with LocalStack Support, etc.

Follow-up work (the "not yet supported" cases)

These pages are annotated rather than migrated, and should be revisited as lstk gains the relevant features, or we find better ways to support them.

• Extensions (index, managing, developing) — lstk has no extensions command suite.
• DevContainers — the upstream devcontainer-template repo installs the legacy CLI.
• Podman / Rancher Desktop — depend on DOCKER_CMD and friends, which lstk has no equivalent for.
• dns-server — localstack dns systemd-resolved has no lstk equivalent.

🤖 Generated with Claude Code

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