⚒️ Restructured Sass organisation (#83)

*  🌈  Organise colors with vars only

*  ➕ New file structure

* File restructuring

*  ⚒️ Fix build issue

* Rearranged files

assets/css/structures/_header.scss

@@ -0,0 +1,44 @@
+.title__thicc {
+  // a sensible base font size
+  font-size: 3rem;
+  line-height: 0.75;
+  padding: 0;
+  margin: 0.5rem 0rem;
+  // transform: rotateZ(90deg);
+  // margin: 13rem -7rem;
+}
+
+@media (min-width: 51rem) and (min-height: #{pxToRem(400)}) {
+  // a dramatic font size
+  .title__thicc {
+    font-size: 12vh;
+  }
+}
+
+@media (min-width: 51rem) and (min-height: #{pxToRem(850)}) {
+  // cap the max-height of the title
+  // at the same size that 12vh computes to
+  // when the viewport is 850px high
+  .title__thicc {
+    font-size: 6.75rem;
+  }
+}
+
+@media (min-width: #{pxToRem(800)}) {
+  .title__thicc {
+    grid-column: 1 / 3;
+  }
+
+  .title__thicc + p {
+    grid-column: 1 / 2;
+  }
+}
+
+.sub-headline {
+  font-weight: bold;
+  font-size: 1.25rem;
+}
+
+.summary {
+  grid-column: span 2;
+}