chore(package): update version to 0.21.0 and add new scripts for artwork generation

Entire-Checkpoint: c6e522b4276c

package.json

@@ -1,6 +1,6 @@
 {
     "name": "iptvnator",
-    "version": "0.20.0",
+    "version": "0.21.0",
     "license": "MIT",
     "description": "IPTV player application.",
     "homepage": "https://github.com/4gray/iptvnator",
@@ -27,6 +27,8 @@
         "serve:frontend": "nx serve web --no-tui",
         "serve:frontend:pwa": "nx serve web --configuration=pwa --no-tui",
         "serve:backend": "nx serve electron-backend",
+        "serve:marketing-demo": "nx run-many --target=serve --projects=xtream-mock-server,electron-backend --parallel=2",
+        "serve:marketing-demo:web": "nx run-many --target=serve --projects=xtream-mock-server,web --parallel=2",
         "test:frontend": "nx test web",
         "test:backend": "nx test electron-backend",
         "test:unit:all": "nx run-many --target=test --all --parallel=3",
@@ -35,11 +37,17 @@
         "typecheck:backend": "tsc -p apps/electron-backend/tsconfig.app.json --noEmit",
         "typecheck:ci": "pnpm run typecheck:web && pnpm run typecheck:backend",
         "verify:package-layout": "node tools/packaging/verify-electron-package-layout.mjs",
+        "embedded-mpv:build-runtime": "node tools/embedded-mpv/build-macos-runtime.mjs",
+        "embedded-mpv:stage-runtime": "node tools/embedded-mpv/stage-macos-runtime.mjs",
         "package:app": "nx run electron-backend:make --prepackageOnly",
         "make:app": "nx run electron-backend:make",
         "smoke:packaged": "node tools/testing/launch-packaged-electron.mjs",
         "serve:website": "nx serve website",
         "build:website": "nx build website",
+        "release:artwork:dry-run": "tsx tools/release/generate-marketing-artwork.ts --dry-run",
+        "release:artwork:manifest": "tsx tools/release/generate-marketing-artwork.ts --manifest",
+        "release:artwork:generate": "tsx tools/release/generate-marketing-artwork.ts --generate",
+        "release:artwork:validate": "tsx tools/release/generate-marketing-artwork.ts --validate",
         "lint": "nx lint electron-backend",
         "build": "nx build electron-backend",
         "wiki:export": "node tools/wiki/export-wiki-context.mjs",