Link styles when hovering

[notabene]

Hi,

Related to issue #537

When lionks go bold on hover, the flow is redrawn.

In the following example one can see that the link takes up more space and the following content (“et”) is pushed to the right.

1. 
2. 

Suggested solution:

1. Not go bold on hover
2. If we really want a visual effect, we can work on the underline style.

E.g. :

a:hover {
  text-decoration-color: #f16e90;
  text-decoration-thickness: 3px;
}

[notabene]

cf. #793 (@Aniort was faster than me 😁 )

[pya35]

cf. #793 (@Aniort est allé plus vite que moi 😁 )

#793 is much poorly written.