pygbag: add page (#18464)

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>
Co-authored-by: Lena Pastwa <126529524+acuteenvy@users.noreply.github.com>

pages/common/pygbag.md

@@ -0,0 +1,36 @@
+# pygbag
+
+> Package Pygame projects as WebAssembly to run in web browsers.
+> More information: <https://pygame-web.github.io>.
+
+- Package a Pygame project and start a local test server:
+
+`pygbag {{path/to/project_folder}}`
+
+- Package using Python module syntax:
+
+`python -m pygbag {{path/to/project_folder}}`
+
+- Package and build without starting the test server:
+
+`pygbag {{path/to/project_folder}} --build`
+
+- Package with a specific template:
+
+`pygbag {{path/to/project_folder}} --template {{template_name.tmpl}}`
+
+- Package and create a ZIP archive for <https://itch.io>:
+
+`pygbag {{path/to/project_folder}} --archive`
+
+- Package with optimization turned off:
+
+`pygbag {{path/to/project_folder}} --no_opt`
+
+- Specify a custom port for the test server:
+
+`pygbag {{path/to/project_folder}} --port {{8080}}`
+
+- Display help:
+
+`pygbag {{[-h|--help]}}`