Look & feel updates: replace the "FAB" with a footer menu item, update the side menu (#263)

* Remove old tab controls from the mobile shell

* Add 'compose' and 'profile' to the footer; remove the FAB

* Fix lint

* Tune the footer icons

* Tune the 'current' state of footer icons

* Add 2xl text styles

* Tune the footer icons a bit more

* Fix lint

* More footer tuning

src/lib/themes.ts

@@ -82,6 +82,31 @@ export const defaultTheme: Theme = {
     },
   },
   typography: {
+    '2xl-thin': {
+      fontSize: 18,
+      letterSpacing: 0.25,
+      fontWeight: '300',
+    },
+    '2xl': {
+      fontSize: 18,
+      letterSpacing: 0.25,
+      fontWeight: '400',
+    },
+    '2xl-medium': {
+      fontSize: 18,
+      letterSpacing: 0.25,
+      fontWeight: '500',
+    },
+    '2xl-bold': {
+      fontSize: 18,
+      letterSpacing: 0.25,
+      fontWeight: '700',
+    },
+    '2xl-heavy': {
+      fontSize: 18,
+      letterSpacing: 0.25,
+      fontWeight: '800',
+    },
     'xl-thin': {
       fontSize: 17,
       letterSpacing: 0.25,