Show multiple warnings in documentation layout

[seanstrom]

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What

• Adjust site layout to allow showing multiple warnings

Why

When viewing documentation for a package, the site will only show a single warning near the top of the page (in the "header-underbar") if any warning exists. Sometimes a package will have multiple warnings (old and incompatible), but only the incompatible warning will be shown. It may be still useful to see the other warnings because they have useful information (like links to newer versions).

Screenshots

Before

After