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Fixes #17196
Closes #17510

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Move them to footer, and remove duplicate ones.

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Fix #17173

Fix #17166

(reported by ianhernandez in Slack)

When a DOM node is passed to an HTML tooltip, the `title` node is only
moved if it is not already in the tooltip. Otherwise, `empty()` is used
instead of `detach()` before appending the `title` to avoid memory
leaks. If a DOM node is passed to a plain text tooltip, its text is
copied via jQuery `.text()`.

Replaces `.detach()` with `.empty()`, as `.detach()` is almost never
useful but instead leaks memory. The difference between `empty` and
`detach` is that the latter keeps all the attached jQuery events/data.
However, since we do not return the previous children, the user would
have to keep these themselves, thus they can `detach()` if necessary.

This is a port of https://github.com/twbs/bootstrap/pull/14552 to v4.

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Related to #17314.

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1) Update it to v1.0.8
2) Include jekyll-search where it's used only

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Before: 538 KB (551.052 bytes)
After:  179 KB (183.296 bytes)

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Before: 1,28 MB (1.351.880 bytes)
After:  1,27 MB (1.341.411 bytes)

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