satis: add page

pages/common/satis.md

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+# satis
+
+> The command-line utility for the Satis static Composer repository.
+
+- Initialise a Satis configuration:
+
+`satis init {{satis.json}}`
+
+- Add a VCS repository to the Satis configuration:
+
+`satis add {{repository_url}}`
+
+- Build the static output from the configuration:
+
+`satis build {{satis.json}} {{path/to/output_directory}}`
+
+- Build the static output by updating only the specified repository:
+
+`satis build --repository-url {{repository_url}} {{satis.json}} {{path/to/output_directory}}`
+
+- Remove useless archive files:
+
+`satis purge {{satis.json}} {{path/to/output_directory}}`