pygbag: add page

pages/common/pygbag.md

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+# pygbag
+
+> Build and serve Python projects for the web (WebAssembly) using Emscripten.
+> Used mainly with pygame-based applications.
+> More information: <https://pygame-web.github.io/wiki/pygbag/>.
+
+- Build the current Python project into a web bundle:
+`pygbag build`
+
+- Serve the web bundle locally on port 8000:
+`pygbag serve --port {{8000}}`
+
+- Specify a different directory to serve:
+`pygbag serve {{path/to/build_directory}}`
+
+- Clean previously generated build artifacts:
+`pygbag clean`
+
+- Enable debug mode while serving:
+`pygbag serve --debug`
+
+- Export a project to a distributable zip file:
+`pygbag export`
+
+- Show available templates for web packaging:
+`pygbag --template`
+
+- Display help for all commands:
+`pygbag --help`