Adjust gatsby theme

packages/gatsby-theme/decks/beep.mdx

@@ -7,12 +7,4 @@
 
 ---
 
-Does HMR break with this change?
-
----
-
-Beep boop bop
-
----
-
-Or not
+HMR *should* work now

packages/gatsby-theme/gatsby-node.js

@@ -168,11 +168,12 @@ exports.onCreateNode = ({
   if (node.internal.type !== `Mdx` || source !== contentPath) return
 
   const slug = toPath(fileNode)
+  const id = createNodeId(`${node.id} >>> Deck`)
 
   createNode({
     slug,
     // Required fields.
-    id: createNodeId(`${node.id} >>> Deck`),
+    id,
     parent: node.id,
     children: [],
     internal: {
@@ -182,7 +183,7 @@ exports.onCreateNode = ({
       description: `Slide Decks`,
     },
   })
-  createParentChildLink({ parent: fileNode, child: node })
+  createParentChildLink({ parent: fileNode, child: getNode(id) })
 }
 
 exports.onCreateDevServer = ({ app }) => {

packages/gatsby-theme/src/components/deck.js

@@ -120,7 +120,6 @@ export default ({
           <Global
             styles={{
               body: {
-                margin: 0,
                 overflow: context.mode === modes.normal ? 'hidden' : null,
               },
             }}

packages/gatsby-theme/src/gatsby-plugin-theme-ui/components.js

@@ -9,25 +9,6 @@ import {
   Split,
   SplitRight,
 } from '..'
-// hack for gatsby-plugin-mdx caching bug
-import {
-  dark,
-  future,
-  condensed,
-  yellow,
-  swiss,
-  poppins,
-  book,
-  script,
-  comic,
-  notes,
-  lobster,
-  hack,
-  rye,
-  big,
-  aspect,
-  aspect43,
-} from '@mdx-deck/themes'
 
 export default {
   Appear,
@@ -39,21 +20,4 @@ export default {
   Invert,
   Split,
   SplitRight,
-  // hack for gatsby-plugin-mdx caching bug
-  dark,
-  future,
-  condensed,
-  yellow,
-  swiss,
-  poppins,
-  book,
-  script,
-  comic,
-  notes,
-  lobster,
-  hack,
-  rye,
-  big,
-  aspect,
-  aspect43,
 }