Sidebar work: added collapsing categories

Big refactoring of SCSS

active state for sidebar links

update gitignore for node_modules folder

removing node_modules from index

Sticky Liquid link in sidebar

Cleaned up index page

Adding fixed width to buttons

Refactoring

Converted sidebar to use Collections

Refactor sidebar CSS

_sass/modules/_base.scss

@@ -1,3 +1,7 @@
+* {
+  box-sizing: border-box;
+}
+
 /**
  * Reset some basic elements
  */
@@ -169,4 +173,4 @@ table {
     border: 1px solid #ddd;
     padding: 6px 13px;
   }
-}
+}

_sass/modules/_buttons.scss

@@ -0,0 +1,32 @@
+.btn {
+  color: $color-white;
+  display: inline-block;
+  background: $color-blue-5;
+  padding: $spacing-unit/4 $spacing-unit/2;
+  width: 200px;
+  border-radius: 4px;
+
+  &:hover {
+    background: $color-blue-4;
+    text-decoration: none;
+    cursor: pointer;
+  }
+}
+
+.btn:visited {
+  color: $color-white;
+}
+
+.btn-row {
+  display: flex;
+  justify-content: center;
+
+  .btn:not(:first-child) {
+    margin-left: $spacing-unit / 2;
+  }
+}
+
+.icon {
+  vertical-align: middle;
+  margin-right: $spacing-unit / 4;
+}

_sass/modules/_home-banner.scss

@@ -0,0 +1,8 @@
+.home--banner {
+  text-align: center;
+
+  h1 {
+    font-weight: bold;
+    font-size: 5em;
+  }
+}

_sass/modules/_layout.scss

@@ -0,0 +1,104 @@
+
+$sidebar-width: 225px;
+$logo-height: 130px;
+$wrapper-width: 800px;
+
+/*============================================================================
+  Content Area
+ ==============================================================================*/
+
+.content {
+  padding: $spacing-unit $spacing-unit $spacing-unit ($spacing-unit + $sidebar-width);
+  width: 100%;
+}
+
+.wrapper {
+  max-width: $wrapper-width;
+  margin: 0 auto;
+  padding: 0 $spacing-unit;
+  @extend %clearfix;
+}
+
+/*============================================================================
+  Sidebar
+ ==============================================================================*/
+
+.sidebar {
+  background: $color-blue-5;
+  width: $sidebar-width;
+  height: 100vh;
+  position: fixed;
+}
+
+.sidebar--logo {
+  font-size: $base-font-size * 2;
+  font-weight: bold;
+  text-align: center;
+  height: $logo-height;
+  line-height: $logo-height;
+  margin-bottom: 0;
+  border-bottom: 1px solid $color-blue-4;
+
+  a {
+    color: $color-white;
+  }
+}
+
+.sidebar--nav {
+  padding: $spacing-unit $spacing-unit ($spacing-unit + $logo-height); // Add a bit more padding at the bottom for consistency.
+  font-weight: bold;
+  max-height: 100%;
+  overflow-y: scroll;
+
+  li {
+    list-style: none;
+
+    a {
+      color: $color-white;
+
+      &:hover {
+        text-decoration: none;
+      }
+    }
+  }
+}
+
+.section {
+  margin: 0px;
+
+  > li {
+    margin-bottom: $spacing-unit / 2;
+
+    &:last-child {
+      margin-bottom: $spacing-unit;
+    }
+  }
+}
+
+.section__header {
+  font-weight: bold;
+  font-size: 1em;
+  color: $color-white;
+  margin-bottom: $spacing-unit / 4;
+}
+
+.section__links {
+  margin-left: $spacing-unit / 2;
+  font-weight: normal;
+  font-size: 0.9em;
+}
+
+.section__link {
+  display: inline-block;
+  margin-top: $spacing-unit/4;
+  opacity: 0.75;
+
+  &:hover {
+    opacity: 1;
+  }
+}
+
+.section__link--is-active {
+  font-weight: bold;
+  opacity: 1;
+}

_sass/modules/_page-content.scss

@@ -0,0 +1,10 @@
+td {
+  code {
+    border: none;
+    background: none;
+  }
+}
+
+p {
+  line-height: 1.8;
+}