Enable automatic README generation (#132)

.github/workflows/generate-screenshots.yml

@@ -20,14 +20,18 @@ jobs:
           xvfb-run glxinfo
       - name: Collect screenshots
         run: xvfb-run ./gradlew collectScreenshots
+      - name: Build main readme
+        run: xvfb-run ./gradlew buildMainReadme
       - name: Prepare media branch
         run: |
           git config --global user.email "actions@openrndr.org"
           git config --global user.name "OPENRNDR Actions"
           git reset HEAD -- .
+          (git add README.md && git commit -m "add auto-generated README" && git push origin master) || true
           (git add [a-z-]*/README.md && git commit -m "add demos to README.md" && git push origin master) || true
           git checkout --orphan media
           git reset HEAD -- .
           git add [a-z-]*/images/*.png
           git commit -m "add auto-generated media"
           git push -f origin media
+