Docs: Revise template creation manual (#6988)
Docs: Revise template creation manual (#6988)

* Update template creation docs.

* A couple tweaks.

* Update 'get story JSON' steps.

* s/local environment/shared environment

* Clean up.
GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp,GoogleForCreators/web-stories-wp