Add share links at the end of the tutorial (#4890)

Co-authored-by: Reuben Tier <64310361+TheOtterlord@users.noreply.github.com>
Co-authored-by: Paul Valladares <85648028+dreyfus92@users.noreply.github.com>

src/content/docs/en/tutorial/6-islands/3.mdx

@@ -13,6 +13,7 @@ import Box from '~/components/tutorial/Box.astro';
 import Checklist from '~/components/Checklist.astro';
 import CompletionConfetti from '~/components/tutorial/CompletionConfetti.astro';
 import PreCheck from '~/components/tutorial/PreCheck.astro';
+import Button from '~/components/Button.astro';
 
 
 There's one more edit to make...
@@ -65,3 +66,16 @@ Continue with our [guide to migrate this project to content collections](/en/gui
 [Join us on Discord](https://astro.build/chat)
 
 <CompletionConfetti />
+
+## Share your achievement!
+
+Congratulations on completing the Astro blog tutorial! Share your achievement with the world and let everyone know you're an Astronaut now!
+
+<div style="display: flex; flex-wrap: wrap; gap: 0.5rem;">
+  <Button href='https://twitter.com/intent/tweet?text=Just%20finished%20learning%20how%20to%20build%20my%20first%20Astro%20blog!%20Check%20it%20out%20at%20https://docs.astro.build/%0Avia%20%40astrodotbuild'>
+    Share on Twitter
+  </Button> 
+  <Button href='https://www.reddit.com/submit?url=https://docs.astro.build/&title=Just%20finished%20learning%20how%20to%20build%20my%20first%20Astro%20blog!'>
+    Share on Reddit
+  </Button>
+</div>