Delete specified subsite

• command: spo web remove -u|--webUrl <webUrl> --confirm
• webUrl: URL of the subsite to remove
• confirm: Do not prompt for confirmation before deleting the subsite

Delete subsite using:

POST <webUrl>/_api/web
accept: application/json;odata=nometadata
X-HTTP-Method: DELETE
x-requestdigest: 0x5AB7E...

Ensure you have access token for the web specified in the `webUrl` option.