attach taskbar to <head> instead of <head>\n

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Fixed a regression introduced in block-external-links feature.

For cleaner source, the taskbar (and the block-external JS file) were both
attached to `<head>\n`.
Unfortunately, this isn't safe enough as some ZIM files might have all kinds of HTML
syntax. Sotoki for instance have no CR after head, rendering the attachment impossible.

Note: realizing this method is somehow fragile as any HTML content with extra attribute
on the `<head>` tag or without a `<head>` tag would break the taskbar and the block external feature.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f