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)
Several imported types and values from `@angular-devkit/core` could be removed while still
maintaining the same functionality. This further reduces the schematics direct dependence
on the `@angular-devkit/core` package.
With this change we update the validation of the libraries and application projects names to fully allow characters that make a valid NPM package name. http://json.schemastore.org/package has been used as reference.
We also remove validators that are no longer needed.
Closes#11051
