Adding more space to the H1 to match the left menu

As per @thomasgohard recommendation in this issue : https://github.com/wet-boew/wet-boew/issues/5086

Adding 20px to the margin-top of the H1 to match the 20px of the sec-nav menu!
Update _mediumViewOver.scss
Merge pull request #106 from crochefort/patch-2

Adding more space to the H1 to match the left menu