RFR: 8351626: Update remaining icons to SVG format

[Hannes Wallnöfer]

On Wed, 12 Mar 2025 13:22:07 GMT, Hannes Wallnöfer <hannesw at openjdk.org> wrote:

> Please review a change to update the remaining `.png` files used by JavaDoc with `.svg` files. In addition to the looking glass and "x" icons used in the search box this also adds left and right pointing angles used in breadcrumb navigation and sidebar hide/show buttons that previously used glyphs.

Thanks!

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PR Comment: https://git.openjdk.org/jdk/pull/24007#issuecomment-2718350124