pygbag: add page

pages/common/pygbag.md

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+# 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 --build {{path/to/project_folder}}`
+
+- Package with a specific template:
+
+`pygbag --template {{template_name.tmpl}} {{path/to/project_folder}}`
+
+- Package and create a ZIP archive for itch.io:
+
+`pygbag --archive {{path/to/project_folder}}`
+
+- Package with optimization turned off:
+
+`pygbag --no_opt {{path/to/project_folder}}`
+
+- Specify a custom port for the test server:
+
+`pygbag --port {{8080}} {{path/to/project_folder}}`
+
+- Display help information:
+
+`pygbag --help`