By using the `@angular/build` package directly within projects for each
example and tutorial, the total install size can be reduced. This lowers the amount
of time required to be spent setting up the dependencies in browser
before the example is displayed.
The `@angular/build@19.2.0-next.2` package currently has a total unpacked size of ~115 MB.
The `@angular-devkit/build-angular@19.2.0-next.2` package currently has a total unpacked size of ~291 MB.
This also removes the now unneeded `NG_BUILD_PARALLEL_TS=0` environment variable usage.
PR Close#60046
To increase the ease of development we are moving @angular/docs into the adev directory within this repo. While
we are doing this to improve our development experience in the short term, efforts are also in place
to maintain a division between this @angular/docs (shared) code and adev itself, so that it can be extracted
back out in the future when components is ready to leverage it as well.
PR Close#57132
