Update index.md (MystenLabs#1030)

added space to prototypes

doc/src/explore/index.md

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 <iframe id="ytplayer" type="text/html" src="https://www.youtube.com/embed/sAMT5x8W3B8?autoplay=0"  frameborder="0"></iframe>
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 [Panzerdogs x Sui](../explore/panzerdogs.md) - an example of how the Sui infrastructure delivers a more integrated feedback loop between gameplay and NFT ownership.
 <section class="sui-dev-video">
 
 <iframe id="ytplayer" type="text/html" src="https://www.youtube.com/embed/Nx7hTb8dOb4?autoplay=0" frameborder="0"></iframe>
 </section>
 
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 [SoWork x Sui](../explore/sowork.md) - building features on Sui to power creative employee rewards and custom NFT mints via SoWork's mapmaker.
 <section class="sui-dev-video">