Anchored position element align= attribute conflicting with html align attribute

[jonrohan]

https://primer-lookbook.github.com/view-components/lookbook/inspect/primer/alpha/overlay/middle_of_page?_display=%257B%2522theme%2522%253A%2522light%2522%257D&size=medium

I noticed that the in the Overlay when there's a menu with a header the title aligns strangely. I thought for a minute this was part of the design but realized that this is because the browser has a built in align= attribute.

I think to fix this we should have the <anchored-position element use anchor-align and anchor-side. To support any existing cases we could have it use either. But we should update our components to output the non-conflicting attribute

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