docs: improved SEO of documentation (#3117)

* docs: added description to documentation pages

* docs: added more descriptions

* docs: finished improving meta description

* docs: added searchbox structured data

* docs: added breadcrumbs structured data

* docs: added how to structured data

* docs: improved 404 page

* docs: added how-to frontmatter option

www/docs/sidebars.js

@@ -32,17 +32,18 @@ module.exports = {
           items: [
             {
               type: "doc",
-              id: "quickstart/quick-start",
-              label: "Quickstart Guide",
+              id: "usage/create-medusa-app",
+              label: 'create-medusa-app'
             },
             {
               type: "doc",
-              id: "usage/create-medusa-app",
-              label: 'Use create-medusa-app'
+              id: "quickstart/quick-start",
+              label: "Server Quickstart",
             },
             {
               type:"doc",
               id: "quickstart/quick-start-docker",
+              label: "Server Quickstart: Docker",
             },
           ]
         },