hide loading screen after dom-ready event
hide loading screen after dom-ready event

also hardcode `about` positioning in sidebar

NebulousLabs/New-Sia-UI,NebulousLabs/Sia-UI,NebulousLabs/Sia-UI,NebulousLabs/Sia-UI,NebulousLabs/New-Sia-UI,rivine/rivine-UI,NebulousLabs/New-Sia-UI,rivine/rivine-UI,rivine/rivine-UI