chore(release): bump extension to 0.9.0
feat(welcome): Open the welcome page on install and report the pin state
feat(welcome): Build the welcome page address
feat(i18n): Store summaries without brand names in all 52 languages
feat(i18n): English summary without third-party brand names
feat(i18n): Store name and summary in all 52 Chrome languages
feat(ext): give the site link its own row in the popup footer
feat(ext): declare the search counting to AMO, and let Firefox own it