fix: aio logout from browser, add more info to login web page

Right now `aio logout` will not log you out in a browser context.
When the command is run, we should spawn a browser instance and go to the IMS url to logout a user. Provide a flag to opt-out of this behaviour for headless use cases.

Also the web page that says you are logged in, should have a link to log you out as well.
Additionally, that same web page can show what org/env you are in.

Trace the `aio logout` command and the login web page, then identify the IMS URL and existing browser and headless paths. Done means browser logout works by default, an opt-out flag supports headless use, and the logged-in page links to logout and shows the current organization and environment; no files or tests are named.

Written by the indexing model from the issue text.