chore: deprecate lm command

[kaelig]

Summary

The Large Media feature was deprecated on September 1st, 2023 and will become unavailable in a future update. Learn more and discover alternative solutions

As a result, we'll hide the lm command from the CLI. It will keep working, but we recommend against setting up Large Media on new sites.

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[github-actions]

📊 Benchmark results

Comparing with 34e0faa

• Dependency count: 1,331 (no change)
• Package size: 295 MB ⬆️ 0.00% increase vs. 34e0faa

[sarahetter]

LGTM!

[Skn0tt]

Hi! Could you please mark this as a fix: or feat:-commit next time? chore doesn't get listed in our changelog, and it feels like this PR warrants a changelog entry. I'll manually update the Github release when it's cut, so this is listed.

[kaelig]

Absolutely — I didn't realize chores weren't surfaced in release notes!