UI fixes

[Gauravjeetsingh]

Fixes the issues mentioned in #1837 except the next line functionality. I will open a separate PR for next line.

• [x] 50px v 65px line height - increase line height by 30%
• [x] Make font bold
• [x] Line hover background (light grey)
• [x] Spacing of buttons at the top of navigator
• [x] New icons inc. hide screen
• [x] Hide icon for lines.
• [x] Move “make home” button to right and show on line hover.
• [ ] A way to show what line would be shown next if space bar pressed.
• [x] Fixing the scroll
• [x] Narrow toolbar
• [ ] Change Icon for ceremonies
• [x] Spacing between stuff.
• [x] 50px v 65px line height - increase line height by 30%