Update merch-store.md

[KendalHall]

Added how to reorder, and our general cadence of when we launch new products, and inventory levels

Changes

Please describe.

Add screenshots or screen recordings for visual / UI-focused changes.

Checklist

• Words are spelled using American English
• Titles are in sentence case
• Feature names are in sentence case too
• Use relative URLs for internal links
• If I moved a page, I added a redirect in vercel.json
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Article checklist

• I've added (at least) 3-5 internal links to this new article
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• The date on the article is today's date
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Name	Status	Preview	Updated (UTC)
posthog	✅ Ready (Inspect)	Visit Preview	Feb 12, 2025 11:18am

[charlescook-ph]

Looks good! I edited the page a bit while we're here anyway to clean it up a bit.