chore(docs): add client data fetching to sidebar (#13168)
chore(docs): add client data fetching to sidebar (#13168)

* feat: add client data fetching doc to sidebar

* chore: consistency in sidebar text

* feat: the linking between pages doc is essentially the routing doc. these can be consolidated, the stub is probably unnecessary

* chore: consistency in sidebar text

* fix: correct doc sidebar entry

* fixing title casing & wording, routing section

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