Adds delete node code snippets to the cheatsheet.md

[Stockfoot]

Description

Related Drupal Issue(s): Add to Cheatsheet: User/User Role can delete a piece of content

This PR adds 2 items to the cheatsheet

• Delete content from node page
• Delete content from node edit page

[paulsheldrake]

There may be a new support function here... something like

deleteNode($title) {
visit(/admin/content)
search filter for title
click delete in the options
check yes
}

it would require that user have permissions to the content overview page