style: sidebar styling (#194)

* style: sidebar styling

* style: hover and selected colors

* chore: split the sidebar items into separate component

* style: pretty much finished except for status button

* feat: sidebar status button as a separate component

* chore: spacing definition

* style: size of the status text

* fix: hiden navigation on small height screens

src/theme.tsx

@@ -9,6 +9,12 @@ declare module '@material-ui/core/styles/createPalette' {
 
 // Overwriting default components styles
 const componentsOverrides = (theme: Theme) => ({
+  MuiDrawer: {
+    paper: {
+      width: 300,
+      backgroundColor: '#212121',
+    },
+  },
   MuiTab: {
     root: {
       backgroundColor: 'transparent',