Brand tuning: switch from "blueprint B" to "cloud imagery" (#96)

* Switch app icon to bluesky image

* Update splash screen to clouds

* Update login screen to use branding

* Lighten the shadows in the brand imagery

src/view/com/login/Logo.tsx

@@ -1,42 +1,9 @@
 import React from 'react'
-import {StyleSheet, View} from 'react-native'
+import {StyleSheet} from 'react-native'
 import LinearGradient from 'react-native-linear-gradient'
-import Svg, {Circle, Line, Text as SvgText} from 'react-native-svg'
 import {s, gradients} from '../../lib/styles'
 import {Text} from '../util/text/Text'
 
-export const Logo = ({color, size = 100}: {color: string; size?: number}) => {
-  return (
-    <View style={styles.logo}>
-      <Svg width={size} height={size} viewBox="0 0 100 100">
-        <Circle
-          cx="50"
-          cy="50"
-          r="46"
-          fill="none"
-          stroke={color}
-          strokeWidth={2}
-        />
-        <Line stroke={color} strokeWidth={1} x1="30" x2="30" y1="0" y2="100" />
-        <Line stroke={color} strokeWidth={1} x1="74" x2="74" y1="0" y2="100" />
-        <Line stroke={color} strokeWidth={1} x1="0" x2="100" y1="22" y2="22" />
-        <Line stroke={color} strokeWidth={1} x1="0" x2="100" y1="74" y2="74" />
-        <SvgText
-          fill="none"
-          stroke={color}
-          strokeWidth={2}
-          fontSize="60"
-          fontWeight="bold"
-          x="52"
-          y="70"
-          textAnchor="middle">
-          B
-        </SvgText>
-      </Svg>
-    </View>
-  )
-}
-
 export const LogoTextHero = () => {
   return (
     <LinearGradient
@@ -44,8 +11,7 @@ export const LogoTextHero = () => {
       start={{x: 0, y: 0}}
       end={{x: 1, y: 1}}
       style={[styles.textHero]}>
-      <Logo color="white" size={40} />
-      <Text type="title-lg" style={[s.white, s.pl10]}>
+      <Text type="title-lg" style={[s.white, s.bold]}>
         Bluesky
       </Text>
     </LinearGradient>