Add bounties box to communites page (#53)

root-pages/community.mdx

@@ -46,5 +46,12 @@ import { Grid, Box, SocialCard } from '/src/components/mdx'
         description="Share your thoughts on the latest research on the Vac research forum"
       />
     </Grid.Item>
+    <Grid.Item xs={1}>
+      <SocialCard
+        href="https://github.com/waku-org/bounties/issues"
+        logoSrcDark="/github-mark-white.svg"
+        description="Work on an open bounty"
+      />
+    </Grid.Item>
   </Grid>
 </Box>

static/github-mark-white.svg

@@ -0,0 +1 @@
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