Splits <CycleDayOverView /> to smaller components, to simplify it

components/cycle-day/FillerBoxes.js

@@ -0,0 +1,20 @@
+import React, { Component } from 'react'
+import { View, Dimensions } from 'react-native'
+import styles from '../../styles'
+
+export default class FillerBoxes extends Component {
+  render() {
+    const n = Dimensions.get('window').width / styles.symptomBox.width
+    const fillerBoxes = []
+    for (let i = 0; i < Math.ceil(n); i++) {
+      fillerBoxes.push(
+        <View
+          width={styles.symptomBox.width}
+          height={0}
+          key={i.toString()}
+        />
+      )
+    }
+    return fillerBoxes
+  }
+}