Documentation fixes and integration with defold.com

.github/FUNDING.yml

@@ -0,0 +1,3 @@
+github: defold
+patreon: Defold
+custom: ['https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=NBNBHTUW4GS4C']

.github/workflows/trigger-site-rebuild.yml

@@ -0,0 +1,19 @@
+name: Trigger site rebuild
+
+on: [push]
+
+jobs:
+    site-rebuild:
+        runs-on: ubuntu-latest
+
+        steps: [
+        {
+            name: 'Repository dispatch',
+            uses: defold/repository-dispatch@1.2.1,
+            with: {
+                repo: 'defold/defold.github.io',
+                token: '${{ secrets.SERVICES_GITHUB_TOKEN }}',
+                user: 'services@defold.se',
+                action: 'extension-gpgs'
+            }
+        }]

README.md

@@ -2,5 +2,4 @@
 
 Defold [native extension](https://www.defold.com/manuals/extensions/) which provides access to Google Play Game Services functionality on Android devices.
 
-## API and installation
-[API and setup instructions](https://defold.github.io/extension-gpgs).
+[Manual, API and setup instructions](https://www.defold.com/extension-gpgs/) is available on the official Defold site.