jigsaw: add page

pages/common/jigsaw.md

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+# jigsaw
+
+> A Laravel-based static site builder for PHP.
+> More information: <https://jigsaw.tighten.co>.
+
+- Initialise a project:
+
+`jigsaw init`
+
+- Initialise a project with a specific preset:
+
+`jigsaw init {{preset_name}}`
+
+- Build the site for development:
+
+`jigsaw build`
+
+- Preview the site from the "build_local" directory:
+
+`jigsaw serve`
+
+- Build the site for production:
+
+`jigsaw build production`
+
+- Preview the site from the "build_production" directory:
+
+`jigsaw serve {{build_production}}`