refact: rename Column components to be generic

src/components/Sidebar/styles.tsx

@@ -0,0 +1,56 @@
+import { Link } from "gatsby"
+import styled from "styled-components"
+
+export const SidebarWrapper = styled.div`
+  box-sizing: border-box;
+  flex: 0 0 320px;
+  background: ${props => props.theme.sidebar.background};
+  color: ${props => props.theme.sidebar.foreground};
+  position: fixed;
+  top: 0;
+  bottom: 0;
+  width: 320px;
+
+  @media screen and (max-width: 767px) {
+    z-index: 100;
+    width: auto;
+    /* TODO: maybe find a less "awkward" way to animate this */
+    left: calc(-100% - 100px);
+    right: calc(100% - 0px);
+    transition: left 0.3s, right 0.3s;
+  }
+
+  &.is-open {
+    left: 0;
+    right: 100px;
+    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
+  }
+`
+
+export const Inner = styled.div`
+  padding: 30px 0 30px 20px;
+`
+
+export const Menu = styled.nav`
+  display: flex;
+  flex-direction: column;
+  border-top: 1px dashed #a5a5a5;
+  margin: 20px 0 40px;
+  padding-top: 20px;
+`
+
+export const MenuItem = styled(Link)`
+  padding: 4px 0;
+  font-size: 20px;
+  color: ${props => props.theme.sidebar.foreground};
+  text-decoration: none;
+
+  &:hover,
+  &:active {
+    text-decoration: underline;
+  }
+
+  &.active {
+    font-weight: 700;
+  }
+`