Remove persona and bring stage in line with prod
Fix test_contributor_flow_to_support_forum_post because there are less than 20 questions on stage
Fix test_that_thank_you_page_is_displayed_after_successful_registration
Fix test_that_posting_question_works by adding a step to click on the link that opens the troubleshooting text input
Merge pull request #248 from bobsilverberg/no_persona

Fix all the failures on SUMO stage