Large update for all components

reorganization, linting, updating file imports, consolidation
warning: there will be errors in this commit
todo: update webpack, add missing styles, scss files, consolidate the rest of components within features/*

app/javascript/gabsocial/features/introduction/introduction.scss

@@ -0,0 +1,143 @@
+.introduction {
+  @include flex(center, center, column);
+
+  @media screen and (max-width: 920px) {
+    background: darken($ui-base-color, 8%);
+    display: block !important;
+  }
+
+  &__pager {
+    background: darken($ui-base-color, 8%);
+    box-shadow: 0 0 15px rgba($base-shadow-color, 0.2);
+    overflow: hidden;
+  }
+
+  &__pager,
+  &__frame {
+    border-radius: 10px;
+    width: 50vw;
+    min-width: 920px;
+
+    @media screen and (max-width: 920px) {
+      min-width: 0;
+      width: 100%;
+      border-radius: 0;
+      box-shadow: none;
+    }
+  }
+
+  &__frame-wrapper {
+    opacity: 0;
+    transition: opacity 500ms linear;
+
+    &.active {
+      opacity: 1;
+      transition: opacity 50ms linear;
+    }
+  }
+
+  &__frame {
+    overflow: hidden;
+  }
+
+  &__illustration {
+    height: 50vh;
+
+    @media screen and (max-width: 630px) {
+      height: auto;
+    }
+
+    img {
+      object-fit: cover;
+      display: block;
+      margin: 0;
+
+      @include size(100%);
+    }
+  }
+
+  &__text {
+    &--columnized {
+      display: flex;
+
+      &>div {
+        flex: 1 1 33.33%;
+        text-align: center;
+        padding: 25px;
+        padding-bottom: 30px;
+      }
+
+      @media screen and (max-width: 630px) {
+        display: block;
+        padding: 15px 0;
+        padding-bottom: 20px;
+
+        &>div {
+          padding: 10px 25px;
+        }
+      }
+    }
+
+    h3 {
+      margin-bottom: 10px;
+
+      @include text-sizing(24px, 700, 1.5);
+    }
+
+    p {
+      color: $darker-text-color;
+
+      @include text-sizing(16px, 400, 24px);
+
+      code {
+        display: inline-block;
+        background: darken($ui-base-color, 8%);
+        font-size: 15px;
+        padding: 1px 3px;
+
+        @include border-design(lighten($ui-base-color, 8%), 1px, 2px);
+      }
+    }
+
+    &--centered {
+      padding: 25px;
+      padding-bottom: 30px;
+      text-align: center;
+    }
+  }
+
+  &__dots {
+    padding: 25px;
+
+    @include flex(center, center);
+
+    @media screen and (max-width: 630px) {
+      display: none;
+    }
+  }
+
+  &__dot {
+    background: transparent;
+    margin: 0 3px;
+    cursor: pointer;
+
+    @include size(14px);
+    @include border-design($ui-highlight-color, 1px, 14px);
+
+    &:hover {
+      background: lighten($ui-base-color, 8%);
+    }
+
+    &.active {
+      cursor: default;
+      background: $ui-highlight-color;
+    }
+  }
+
+  &__action {
+    padding: 25px;
+    padding-top: 0;
+
+    @include flex(center, center);
+  }
+}