Update donations page

docs/donate.md

@@ -4,9 +4,34 @@ permalink: /donate/
 layout: page
 ---
 
-## Support the project
+# Subscriptions
 
-You can support the development by sending a donation.
+You can actively support the development with a monthly subscription on Patreon or Flattr.
 
-- PayPal: [https://paypal.me/DavideDepau](https://paypal.me/DavideDepau)
-- Monero: `82WTvrLEdTbULrcgcUnpuzevHaTMURHQfi4Sf5dG3WLjXzP8NwrfTL82HNdV8gnSN183TnLLsR5Q2YWcNJRriHvPPoweT1Q`
+<p align="center">
+<a href="https://www.patreon.com/depau" rel="_noopener" target="_blank"><img alt="Become a Patron" src="/assets/img/become_a_patron_button.png"/></a> &nbsp;&nbsp;&nbsp; <a href="https://flattr.com/@Depau" rel="_noopener" target="_blank"><img alt="Flattr this" src="http://api.flattr.com/button/flattr-badge-large.png"/></a>
+</p>
+
+Supporters who subscribe for $10 or more can ask me to **get listed in the app's
+about page** and in the GitHub README.md.
+
+# One-time
+
+You can buy me a coffee on PayPal or Monero.
+
+### PayPal
+
+[https://paypal.me/DavideDepau](https://paypal.me/DavideDepau)
+
+### Monero
+
+![82WTvrLEdTbULrcgcUnpuzevHaTMURHQfi4Sf5dG3WLjXzP8NwrfTL82HNdV8gnSN183TnLLsR5Q2YWcNJRriHvPPoweT1Q](https://i.imgur.com/8wxtv31.png)
+
+# Bug bounties
+
+Want a new feature or an annoying bug fixed? Post a bounty on it!
+
+Whoever first closes the issue will get the bounty. [See the issues](https://github.com/Depau/EtchDroid/issues).
+
+To post a bounty, simply click the "Post a bounty" link under the issue description.
+If you just created the issue and the link doesn't show up, wait a few minutes so the bounty bot can detect it.