Add h3 styles

Author: mcecode

src/styles/article.scss

@@ -28,7 +28,8 @@ article {
 }
 
 // Inspired from MDN's heading link styles
-h2 a {
+h2 a,
+h3 a {
   text-decoration: none;
 
   &::before {

src/styles/page.scss

@@ -41,7 +41,8 @@ body {
   line-height: 1.6;
 }
 h1,
-h2 {
+h2,
+h3 {
   margin-bottom: v-size(2, "em");
   font-family: v-font("title");
   font-weight: 600;
@@ -53,6 +54,9 @@ h1 {
 h2 {
   font-size: v-size(7);
 }
+h3 {
+  font-size: v-size(6);
+}
 main {
   flex-grow: 1;
 }
@@ -115,6 +119,9 @@ code {
   h2 {
     font-size: v-size(9);
   }
+  h3 {
+    font-size: v-size(7);
+  }
 }
 
 @include m-large {