style: quick fixes

small improvements in app style
- fade in splash screen
- notifications without sound
- change header style
- non selectable text app wide
- change logo
- lock button more accessible
- link to help
- tooltip on collapse delay
- tooltip on private / public event toggle

client/src/common/components/buttons/LockIconBtn.jsx

@@ -6,13 +6,13 @@ export default function LockIconBtn(props) {
   const { clickhandler, active, ref } = props;
   return (
     <Tooltip label='Lock cursor to current'>
-      <IconButton
+        <IconButton
         ref={ref}
         size={props.size || 'xs'}
         icon={<FiTarget />}
         color={active ? 'pink.100' : 'pink.300'}
         borderColor={active ? undefined : 'pink.300'}
-        backgroundColor={active ? 'pink.300' : undefined}
+        backgroundColor={active ? 'pink.400' : undefined}
         variant={active ? 'solid' : 'outline'}
         onClick={clickhandler}
         _focus={{ boxShadow: 'none' }}