docs: improve Deploy Admin to Netlify documentation (#1757)

* changes to deployment pages structure

* fix sidebar links

* added button to quickstart

* comment out button

* comment out button

* added note

* small fixes

* small fixes

www/docs/src/css/custom.css

@@ -144,7 +144,7 @@ article {
 }
 
 @media screen and (min-width: 966px) {
-  article {
+  [class*=docItemContainer] > article {
     margin-left: 50px;
     margin-right: 50px;
     max-width: none