refactor: Move depths and breakpoints out of theme

app/components/Guide.tsx

@@ -2,6 +2,7 @@ import { observer } from "mobx-react";
 import * as React from "react";
 import { Dialog, DialogBackdrop, useDialogState } from "reakit/Dialog";
 import styled from "styled-components";
+import { depths } from "@shared/styles";
 import Scrollable from "~/components/Scrollable";
 import usePrevious from "~/hooks/usePrevious";
 
@@ -72,7 +73,7 @@ const Backdrop = styled.div`
   right: 0;
   bottom: 0;
   background-color: ${(props) => props.theme.backdrop} !important;
-  z-index: ${(props) => props.theme.depths.modalOverlay};
+  z-index: ${depths.modalOverlay};
   transition: opacity 200ms ease-in-out;
   opacity: 0;
 
@@ -87,7 +88,7 @@ const Scene = styled.div`
   right: 0;
   bottom: 0;
   margin: 12px;
-  z-index: ${(props) => props.theme.depths.modal};
+  z-index: ${depths.modal};
   display: flex;
   justify-content: center;
   align-items: flex-start;