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/features/editors/list/EventBlock.jsx

@@ -6,7 +6,7 @@ import EventTimes from 'common/components/eventTimes/EventTimes';
 import EventTimesVertical from 'common/components/eventTimes/EventTimesVertical';
 import EditableText from 'common/input/EditableText';
 import ActionButtons from './ActionButtons';
-import VisibleIconBtn from 'common/components/buttons/VisibleIconBtn';
+import PublicIconBtn from 'common/components/buttons/PublicIconBtn';
 import DeleteIconBtn from 'common/components/buttons/DeleteIconBtn';
 import { millisToMinutes } from 'common/dateConfig';
 import style from './EventBlock.module.css';
@@ -93,7 +93,7 @@ const ExpandedBlock = (props) => {
         onClick={() => props.setCollapsed(true)}
       />
       <div className={style.actionOverlay}>
-        <VisibleIconBtn actionHandler={actionHandler} active={data.isPublic} />
+        <PublicIconBtn actionHandler={actionHandler} active={data.isPublic} />
         <ActionButtons
           showAdd
           showDelay
@@ -146,7 +146,7 @@ const CollapsedBlock = (props) => {
         onClick={() => props.setCollapsed(false)}
       />
       <div className={style.actionOverlay}>
-        <VisibleIconBtn actionHandler={actionHandler} active={data.isPublic} />
+        <PublicIconBtn actionHandler={actionHandler} active={data.isPublic} />
         <ActionButtons
           showAdd
           showDelay