title: Python adding titles to x & y axis dash app
body: <p>I am attempting to create a dash app for creating a scatter plot of some data.. Would someone be able to give me a tip for showing titles on the x &amp; y axis of the plot? It seems like most documentation I am finding online seems like its for IPython. Layouts are defined in this format:</p>
  
  <pre><code>layout = dict(
          title= 'Rank',
          ticklen= 5,
          gridwidth= 2,
      )
  </code></pre>
  
  <p>But my dash app looks more like this format: <strong><em>EDIT to include all code below</em></strong></p>
  
  <pre><code>import dash
  import dash_core_components as dcc
  import dash_html_components as html
  import pandas as pd
  import plotly.graph_objs as go
  import numpy as np
  
  external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']
  
  app = dash.Dash(__name__, external_stylesheets=external_stylesheets)
  
  
  
  df = pd.read_csv('boilerData.csv', index_col='Date', parse_dates=True)
  df = df.fillna(method = 'ffill').fillna(method = 'bfill')
  
  app.layout = html.Div([
  
      html.H1('Heating System Temperature Data Visulation'), 
      html.Center('The purpose of the scatter plot below is to prove if a temperature reset strategy is implemented on the hydronic heating system. At various outside air temperature conditions, the hot water temperature should fluctuate to save energy.'),
  
      dcc.Graph(
          id='hwst-vs-oat',
          figure={
              'data': [
                  go.Scatter(
                      x = df.OAT,
                      y = df.HWST,
                      mode = 'markers',
                      marker = dict(
                          color = '#FFBAD2',
                          line = dict(width = 1)
                      )
                  )
              ],
              'layout':{
              'title':'Scatter Plot of OAT versus HWST',
              'xaxis':{
                  'title':'whatever you want x to be'
              },
              'yaxis':{
                   'title':'whatever you want y to be'
              }
          }
      )
  ])
  
  
  if __name__ == '__main__':
      app.run_server(debug=True)
  </code></pre>
  
  <p>Any tips help thank you.</p>