feat: Empty Placeholder Text

[vinnyjth]

🐛 Issue

Liquid wants the ability to set a specific bit of text to appear if a feed is empty.

✏️ Solution

Add a data-empty-placeholder-text attribute that renders if a feed is empty.

🔬 To Test

1. I added an empty feed to the homepage. It looks kinda ugly alone, but it's got classes so it can be styled by the client.
2. You can see it here: https://apollos-web-embeds-git-placeholder-text-apollos-embeds.vercel.app/

📸 Screenshots

[vercel[bot]]

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