chore(www): Adding Title Case to tutorial sidebar menu (#18540)
chore(www): Adding Title Case to tutorial sidebar menu (#18540)

* Remove title case from the heading to match the sidebar menu

* Changed all top-level headings to title case

All top-level headings (the main steps) were converted to title case. The sub-headings were left in sentence case. Also changed instance of css in all lowercase to uppercase.

* revert one change

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