spike: add page (#1716)

pages/common/spike.md

@@ -0,0 +1,19 @@
+# spike
+
+> A fully featured static website generator written in JavaScript.
+
+- Create a new project using the default template:
+
+`spike new {{project_name}}`
+
+- Compile your project, watch for changes, and auto-reload the browser:
+
+`spike watch`
+
+- Compile your project once to the "public" folder:
+
+`spike compile`
+
+- Remove the output directory:
+
+`spike clean`