add AMD logo

[DhairyaLGandhi]

This adds the AMD logo to the front page of the website.
cc @jpsamaroo

@claforte Would you mind reviewing this and approving adding the AMD logo to the Flux website?

[claforte]

I think it's fine... I doubt we need to ask the lawyers for this. If so, I'll deal with the consequences.

[DhairyaLGandhi]

That's very kind, thank you! Would you mind approving the PR?

[claforte]

I don't seem to have permission to add myself as reviewer... but I approve the PR. :-)

[DhairyaLGandhi]

Thanks so much!