Rustdoc mobile: put out-of-band on its own line

Before this, the item name and the stability, source link, and "collapse
all docs" would compete for room on a single line, resulting in awkward
wrapping behavior on mobile. This gives a separate line for that
out-of-band information. It also removes the "copy path" icon on mobile
to make a little more room.

Also, switch to flex-wrap: wrap, so anytime there's not enough room for
`source`, it gets bumped to the next line.

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