message: added command in sidebars.js again
diff: module.exports = {
  docs: {
  - Introduction: ['introduction/installation', 'introduction/getting-started'],
  - Community: ['community/contributing'],
  - },
  + Introduction: [
  + "introduction/installation",
  + "introduction/getting-started",
  + "introduction/commands"
  + ],
  + Community: ["community/contributing"]
  + }
  };
  