Update 404 page text to replace site directory with Sensu docs home page (#3077)
Update 404 page text to replace site directory with Sensu docs home page (#3077)

* Update 404 page text to replace site directory with Sensu Go home page

* Update link and text
sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs