jekyll: add page (#1583)

pages/common/jekyll.md

@@ -0,0 +1,15 @@
+# Jekyll
+
+> A simple, blog-aware, static site generator.
+
+- Generate a development server that will run at http://localhost:4000/:
+
+`jekyll serve`
+
+- Enable incremental regeneration:
+
+`jekyll serve --incremental`
+
+- Generate the current folder into `./_site:`:
+
+`jekyll build`