More specifically:
- Remove Chrome 41, which was needed for googlebot support but not any
more.
- Remove IE 9-10, because we don't expect developers to be using them.
- Expand support from _last 2 versions_ to _last 2 **major** versions_.
PR Close#31045
This commit also changes the config files and their layout to
(reasonably closely) match what the cli would generate for a new app.
Related Jira issue: [TOOL-815](https://angular-team.atlassian.net/browse/TOOL-815)
PR Close#29926