feat: add Ztopia theme (#66)

Author: zicodeng

src/docs/themes/components/Cards.tsx

@@ -13,9 +13,9 @@ const Wrapper = styled.div`
 
 const Card = styled(BaseCard)`
   ${mq({
-      width: ['100%', 'calc(50% - 20px)', 'calc(33% - 20px)', 'calc(33% - 20px)'],
-      margin: ['10px 0', '10px', '10px', '10px']
-    })};
+    width: ['100%', 'calc(50% - 20px)', 'calc(33% - 20px)', 'calc(33% - 20px)'],
+    margin: ['10px 0', '10px', '10px', '10px'],
+  })};
 `
 
 export const Cards: SFC = () => (
@@ -26,5 +26,11 @@ export const Cards: SFC = () => (
       description="Default theme created by docz"
       link="https://github.com/pedronauck/docz/tree/master/core/docz-theme-default"
     />
+    <Card
+      image="https://github.com/zicodeng/docz-theme-ztopia/blob/master/public/images/demo.gif?raw=true"
+      name="docz-theme-ztopia"
+      description="Ztopia theme created by zicodeng"
+      link="https://github.com/zicodeng/docz-theme-ztopia"
+    />
   </Wrapper>
 )