docs(aws/customization): migrate /aws/customization section to use lstk

[peter-smith-phd]

Migrates the /aws/customization section to lstk, following on from #789, #792 and #800.

Configuration

• Lead with LOCALSTACK_DEBUG=1 lstk start as the simplest way to set a config option, keeping the [env.*] profile form as the alternative.
• Removed the Profiles section: it documented the legacy ~/.localstack/*.env + CONFIG_PROFILE mechanism, which lstk replaces with named [env.*] tables. Fixed the two in-page links that pointed at it.
• Replaced the CLI table (CONFIG_PROFILE, CONFIG_DIR) with a pointer to the lstk config reference, and moved LOCALSTACK_VOLUME_DIR into the Docker section, where it still applies.

Networking

• dns-server: replaced the --host-dns flag with expose_ports = [53] in config.toml. Added a caution that localstack dns systemd-resolved is only available in the deprecated CLI.
• route53: same expose_ports change, now cross-linked to the DNS page.
• external-port-range: dropped the legacy CLI tab from the multi-instance example, leaving docker-compose as the only form (running several instances has no lstk equivalent).
• accessing-endpoint-url: converted the "From your container" CLI tab to lstk start. The pre-2.3.0 examples are intentionally left on the legacy CLI, since they document historical versions.

Multi-account

• cross-account-access and multi-account-setups now use lstk aws --account <id> as the primary form, with AWS_ACCESS_KEY_ID noted as an alternative.
• Both pages now point at LocalStack Support rather than GitHub Discussions.

Marked as legacy-only

Extensions (index, managing, developing) and DevContainers keep the legacy localstack CLI, and now say so explicitly with a link to the deprecated CLI page. lstk has no extensions command suite, and the upstream devcontainer-template repo installs the legacy CLI.

Not migrated

• podman and rancher-desktop still use localstack start with DOCKER_CMD, which has no lstk equivalent. Neither page states this yet.
• accessing-endpoint-url "From your container" still needs a user-defined Docker network and localstack wait; lstk supports neither.

Notes for review

Three lstk features referenced here are not yet documented on the lstk page: expose_ports, lstk aws --account, and AWS_ACCESS_KEY_ID pass-through.

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