feat: add custom SMS screen

feat: custom messages database migration
feat: populate custom SMS screen with database data
feat: custom SMS creation modal
fix: small fixes on styling

lib/custom-sms.js

@@ -0,0 +1,17 @@
+const uuid = require('uuid')
+const db = require('./db')
+
+const getCustomMessages = () => {
+  const sql = `SELECT * FROM custom_messages`
+  return db.any(sql)
+}
+
+const createCustomMessage = (event, deviceId, message) => {
+  const sql = `INSERT INTO custom_message (event, device_id, message) VALUES ($2, $3, $4)`
+  return db.none(sql, [uuid.v4(), event, deviceId, message])
+}
+
+module.exports = {
+  getCustomMessages,
+  createCustomMessage
+}