new_contents: #!/usr/bin/env python
  
  import urllib
  
  def img2base64(img):
      return open(img, "rb").read().encode("base64").replace('\n', '')
  
  disabled_base64 = img2base64("assets/no-js.png")
  enabled_base64 = img2base64("assets/jsenabled.png")
  
  
  data = open('bootstrap.js')
  output = []
  for line in data.readlines():
      if line.startswith('const DISABLED_ICON'):
          line = 'const DISABLED_ICON = "data:image/png;base64,%s";\n' % disabled_base64
      if line.startswith('const ENABLED_ICON'):
          line = 'const ENABLED_ICON = "data:image/png;base64,%s";\n' % enabled_base64
      output.append(line)
  
  data.close()
  data = open('bootstrap.js', 'w')
  for line in output:
      data.write(line)
  data.close()
  data = open('index.html', 'w')
  data.write("<img src='data:image/png;base64,%s'>" % disabled_base64)
  data.write("<img src='data:image/png;base64,%s'>" % enabled_base64)
  data.close()
  
subject: Add script to update images in the js code