📝 Reorganize docs + add contributing guide (#687)

apps/docs/contribute/introduction.mdx

@@ -0,0 +1,40 @@
+---
+title: Introduction
+icon: hand-holding-heart
+description: Help us make Rallly better
+---
+
+If you enjoy using Rallly and would like to contribute to its development, here are a few ways you can help out.
+
+<CardGroup cols={2}>
+  <Card title="Donate" icon="coins" href="/contribute/donations">
+    Help fund this project
+  </Card>
+  <Card title="Translate" icon="globe" href="/contribute/translations">
+    Help translate Rallly into your language
+  </Card>
+  <Card
+    title="Report a Bug"
+    icon="bug"
+    href="https://github.com/lukevella/rallly/issues/new?assignees=&labels=bug&template=---bug-report.md&title="
+  >
+    Help us find and fix bugs
+  </Card>
+  <Card title="Documentation" icon="book" href="/contribute/documentation">
+    Help improve our documentation
+  </Card>
+  <Card
+    title="Leave a review on Trustpilot"
+    icon="star"
+    href="https://www.trustpilot.com/review/rallly.co"
+  >
+    Help spread the word
+  </Card>
+  <Card
+    title="Follow @ralllyco on Twitter"
+    icon="twitter"
+    href="https://twitter.com/ralllyco"
+  >
+    Help us grow our community
+  </Card>
+</CardGroup>