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/Editor.module.css

@@ -69,6 +69,12 @@
   }
 }
 
+h1 {
+  font-size: 2.5vh;
+  color: rgba(255, 255, 255, 0.63);
+  padding-bottom: 0.25em;
+}
+
 .mainContainer > div {
   border-radius: 0.5em;
   height: 100%;