Fix (www): next.gatsbyjs.org index page layout on Internet Explorer 11

[anantoghosh]

Fixes layout and logos on ie11 #6398

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[m-allanson]

😍 thanks @anantoghosh!

I think we'll need to get #6416 merged first, which will fix an unrelated issue with creating preview links. Once that's ready we can come back and take a look at this.

[anantoghosh]

Managed to get the logos working too 🎉

[m-allanson]

Great stuff thanks @anantoghosh 👍

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