docs: add Donation Button example page

docs/examples/donation-button.md

@@ -0,0 +1,56 @@
+---
+id: donation-button
+title: Donation Button
+slug: /examples/donation-button
+---
+
+Use the Blink Donation Button widget to accept Bitcoin Lightning donations directly on your website.
+
+It is a frontend-only integration that you can embed with a few lines of HTML and JavaScript.
+
+## Screenshot
+
+<img src="https://raw.githubusercontent.com/blinkbitcoin/donation-button.blink.sv/main/img/meta-standard-1200x630.png" alt="Blink Donation Button generator screenshot" width="900"/>
+
+## Live Generator
+Create and customize your widget at:
+
+* [donation-button.blink.sv](https://donation-button.blink.sv/)
+
+## Quick Embed Example
+
+```html
+<!-- Blink Pay Button widget -->
+<div id="blink-pay-button-container"></div>
+
+<!-- Blink Pay Button script -->
+<script src="https://blinkbitcoin.github.io/donation-button.blink.sv/js/blink-pay-button.js"></script>
+<script>
+  BlinkPayButton.init({
+    username: 'your-blink-username',
+    containerId: 'blink-pay-button-container',
+    buttonText: 'Donate Bitcoin',
+    themeMode: 'light',
+    defaultAmount: 1000,
+    supportedCurrencies: [
+      { code: 'sats', name: 'sats', isCrypto: true },
+      { code: 'USD', name: 'USD', isCrypto: false },
+      { code: 'EUR', name: 'EUR', isCrypto: false }
+    ],
+    debug: false
+  })
+</script>
+```
+
+## Typical Setup Flow
+* Open the widget generator and enter your Blink username.
+* Select theme and supported currencies.
+* Copy the generated snippet into your website.
+* Publish and start receiving Lightning donations.
+
+## Links
+### Source Code
+* [github.com/blinkbitcoin/donation-button.blink.sv](https://github.com/blinkbitcoin/donation-button.blink.sv)
+
+### More Reading
+* [github.com/blinkbitcoin/donation-button.blink.sv/blob/main/README.md](https://github.com/blinkbitcoin/donation-button.blink.sv/blob/main/README.md)

sidebars.js

@@ -113,7 +113,8 @@ const sidebars = {
         'examples/atm-integrations',
         'examples/btcpayserver-plugin',
         'examples/alby-connector',
-        'examples/lnbits-funding-source'
+        'examples/lnbits-funding-source',
+        'examples/donation-button'
       ]
     },
   ],