Proposition: fix the humongous fonts

[ivanjaros]

$h1: (size: 1.7rem,   line-height: 1.7rem,  weight: 300) !default;
$h2: (size: 1.55rem,  line-height: 1.55rem, weight: 300) !default;
$h3: (size: 1.45rem,  line-height: 1.45rem, weight: 400) !default;
$h4: (size: 1.2rem,   line-height: 1.2rem,  weight: 400) !default;
$h5: (size: 1rem,     line-height: 1rem,    weight: 400) !default;
$h6: (size: 0.75rem,  line-height: 0.75rem, weight: 500) !default;
$button-font-size: 12px !default;