Update about:torconnect module to facilitate new censorship-circumvention flow

• Figma: https://www.figma.com/file/yApSDTlsppvH8w2508zV8k/about%3Atorconnect-User-Flows
• Design Doc: https://docs.google.com/document/d/16NVqOvIOdy26vvH7P94D1kXmXoppKTRmv4T--fMfHjg/edit