docs: update ecommerce functionality documentation

[chanceaclark]

What/Why?

Updates the Ecommerce functionality section in the documentation to remove things related to order management as it's a WIP feature right now. Per https://github.com/bigcommerce/catalyst/issues/1515#issuecomment-2445674083 this can cause some confusion when scoping works for clients.

When the full account orders functionality is merged in, we can revert this PR.

Closes #1515

Testing

N/A

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Name	Status	Preview	Comments	Updated (UTC)
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Latest commit: ef3a918ff613f7b514949f6bb73297003f40b50f

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⚡️🏠 Lighthouse report

Lighthouse ran against https://catalyst-latest-46vjgffpi-bigcommerce-platform.vercel.app

🖥️ Desktop

We ran Lighthouse against the changes on a desktop and produced this report. Here's the summary:

Category	Score
🟠 Performance	81
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	82

📱 Mobile

We ran Lighthouse against the changes on a mobile and produced this report. Here's the summary:

Category	Score
🟢 Performance	95
🟢 Accessibility	96
🟢 Best practices	100
🟠 SEO	85