Several smaller code changes to improve type information and remove now
unneeded code structures based on improvements to both Node.js, TypeScript,
and underlying dependencies.
Updates for all angular.io links to the new angular.dev domain. Additionally, adjustment to new resources where the equivalent does not exist on the new site (e.g. Tour of Heroes tutorial)
This update addresses an issue where an older version of the CLI tarball was mistakenly employed in creating a new application via `yarn admin create`.
Additionally, `yarn admin create` now accommodates extra options that can be utilized with `ng new`.
Example:
```
yarn admin create my-app --ssr
```
