Hi alemones,
You will need to change the image links one by one if you have specified the full path to the image.
Alternatively you can avoid having to do this in future by using the following format for images (leaving off the http or https at the start of the src):
<img src="//www.herodoto.com.br/wp-content/uploads/2016/10/hb_caricatura-2.png" />
The main thing I can see that will need to be changed on your page are these two lines of code:
<link rel=”stylesheet” href=”https://fonts.googleapis.com/css?family=Montserrat:400,700″>
<link rel=”stylesheet” href=”https://fonts.googleapis.com/css?family=Lato:300,400,700,300italic,400italic,700italic”>
If you change http to https it will still work.