Fix sidebar initialize & dropdown smooth

[mocfaisal]

Make sidebar method as a global function, fix auto calculate height for submenus

Implement for some case if build SPA application, that sidebar can't reinitialize

how to use

const sidebar = new window.Sidebar(document.getElementById("sidebar"), {
                recalculateHeight: true
            })

Patch for issue #257 (comment)

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[zuramai]

LGTM!