fix(docs): update #urls inside the sidebar on tutorial pages (#11035)
fix(docs): update #urls inside the sidebar on tutorial pages (#11035)

* Fix links in the sidebar for zero part of the tutorial

* Fix links in the sidebar for second and eighth parts of the tutorial

gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby,gatsbyjs/gatsby,gatsbyjs/gatsby,ChristopherBiscardi/gatsby