refact: extract index.sass to styled-components

src/globalStyles.tsx

@@ -14,4 +14,70 @@ export const GlobalStyles = createGlobalStyle`
     font-size: ${BASE_FONT_SIZE}px;
     line-height: ${BASE_LINE_HEIGHT}px;
   }
+
+  /* TODO: probably extract this */
+  .gatsby-highlight pre[class*="language-"].line-numbers {
+    padding-left: 2.8em;
+  }
+
+  .gatsby-highlight {
+    background-color: #fdf6e3;
+    border-radius: 0.3em;
+    margin: 0.5em 0;
+    padding: 1em;
+    overflow: auto;
+  }
+
+  .gatsby-highlight pre[class*="language-"].line-numbers {
+    padding: 0;
+    padding-left: 2.8em;
+    overflow: initial;
+  }
+
+  /* TODO: probably extract this */
+  .tree-view {
+    overflow-y: hidden;
+  }
+
+  .tree-view_item {
+    display: flex;
+    cursor: pointer;
+  }
+
+  .tree-view_item,
+  .tree-view_children > div {
+    padding: 4px 0;
+  }
+
+  .tree-view_children {
+    margin-left: 16px;
+    display: flex;
+    flex-direction: column;
+    align-items: flex-start;
+  }
+
+  .tree-view_children-collapsed {
+    height: 0px;
+  }
+
+  .tree-view_arrow {
+    cursor: pointer;
+    margin-right: 6px;
+    display: inline-block;
+    -webkit-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+  }
+
+  .tree-view_arrow:after {
+    content: "▾";
+  }
+
+  .tree-view_arrow-collapsed {
+    -webkit-transform: rotate(-90deg);
+    -moz-transform: rotate(-90deg);
+    -ms-transform: rotate(-90deg);
+    transform: rotate(-90deg);
+  }
 `