Getting started category landing page (#17841)

* Start building out landing page in index file

* Add articles

* Add a couple more popular articles

* Tweak intro to cover more audiences

* Add TOC back with new organization

* Update content/github/getting-started-with-github/index.md

* Category as product guides section

* Update breadcrumbs.js

* Update server.js

* Update product-landing.html

* Remove TOC listing

* Revert removing TOC

* Update index.md

* Update index.md

* Update content/github/getting-started-with-github/index.md

* Apply suggestions from code review

Co-authored-by: Laura Coursen <lecoursen@github.com>

Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>
Co-authored-by: Laura Coursen <lecoursen@github.com>

lib/path-utils.js

@@ -90,6 +90,22 @@ function getProductStringFromPath (href) {
     : pathParts[1]
 }
 
+function getCategoryStringFromPath (href) {
+  href = getPathWithoutLanguage(href)
+
+  if (href === '/') return null
+
+  const pathParts = href.split('/')
+
+  if (pathParts.includes('early-access')) return null
+
+  const productIndex = allProducts[pathParts[2]]
+    ? 2
+    : 1
+
+  return pathParts[productIndex + 1]
+}
+
 // Return the corresponding object for the product segment in a path
 function getProductObjectFromPath (href) {
   const productFromPath = getProductStringFromPath(href)
@@ -104,5 +120,6 @@ module.exports = {
   getVersionStringFromPath,
   getVersionObjectFromPath,
   getProductStringFromPath,
+  getCategoryStringFromPath,
   getProductObjectFromPath
 }