Remove docs and point to ones on dartlang.org.

app/doc/pub-get.markdown

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----
-title: "Command: Get"
----
-
-    $ pub get [--offline]
-
-This command gets all the dependencies listed in the
-[`pubspec.yaml`](pubspec.html) file in the current working directory, as well as
-their [transitive dependencies](glossary.html#transitive-dependency), and places
-them in a `packages` directory located next to the pubspec. For example:
-
-    $ pub get
-    Got dependencies!
-
-Once the dependencies are acquired, they may be referenced in Dart code. For
-example, if a package depends on `unittest`:
-
-{% highlight dart %}
-import "package:unittest/unittest.dart;
-{% endhighlight %}
-
-When `pub get` gets new dependencies, it writes a
-[lockfile](glossary.html#lockfile) to ensure that future gets will use the
-same versions of those dependencies. Application packages should check in the
-lockfile to source control; this ensures the application will use the exact same
-versions of all dependencies for all developers and when deployed to production.
-Library packages should not check in the lockfile, though, since they're
-expected to work with a range of dependency versions.
-
-If a lockfile already exists, `pub get` uses the versions of dependencies
-locked in it if possible. If a dependency isn't locked, pub will get the
-latest version of that dependency that satisfies all the [version
-constraints](glossary.html#version-constraint). This is the primary difference
-between `pub get` and [`pub upgrade`](pub-upgrade.html), which always tries to
-get the latest versions of all dependencies.
-
-## Getting a new dependency
-
-If a dependency is added to the pubspec and then `pub get` is run, it will
-get the new dependency and any of its transitive dependencies and place them in
-the `packages` directory. However, it won't change the versions of any
-already-acquired dependencies unless that's necessary to get the new
-dependency.
-
-## Removing a dependency
-
-If a dependency is removed from the pubspec and then `pub get` is run, it will
-remove the dependency from the `packages` directory, thus making it
-unavailable for importing. Any transitive dependencies of the removed dependency
-will also be removed, as long as no remaining immediate dependencies also depend
-on them. Removing a dependency will never change the versions of any
-already-acquired dependencies.
-
-## Linked `packages` directories
-
-Every [entrypoint](glossary.html#entrypoint) in a package needs to be next to a
-`packages` directory in order for it to import packages acquired by Pub.
-However, it's not convenient to put every entrypoint at the top level of the
-package alongside the main `packages` directory. You may have example scripts or
-tests that you want to be able to run from subdirectories.
-
-`pub get` solves this issue by creating additional `packages` directories
-that link to the main `packages` directory at the root of your package. It
-assumes your package is laid out according to the [package layout
-guide](package-layout.html), and creates a linked `packages` directory in
-`bin/`, `test/`, and `example/`, as well as their subdirectories.
-
-## The system package cache
-
-Dependencies are not physically stored in the `packages` directory that pub
-creates. Dependencies downloaded over the internet, such as those from Git and
-[pub.dartlang.org](http://pub.dartlang.org), are stored in a system-wide cache
-and linked to from the `packages` directory. This means that if multiple
-packages use the same version of the same dependency, it will only need to be
-downloaded and stored locally once. It also means that it's safe to delete the
-`packages` directory without worrying about re-downloading packages.
-
-By default, the system package cache is located in the `.pub-cache` subdirectory
-of your home directory. However, it may be configured by setting the `PUB_CACHE`
-environment variable before running Pub.
-
-## Getting while offline
-
-If you don't have network access, you can still run `pub get`. Since pub
-downloads packages to a central cache shared by all packages on your system, it
-can often find previous-downloaded packages there without needing to hit the
-network.
-
-However, by default, pub will always try to go online when you get if you
-have any hosted dependencies so that it can see if newer versions of them are
-available. If you don't want it to do that, pass the `--offline` flag when
-running pub. In this mode, it will only look in your local package cache and
-try to find a set of versions that work with your package from what's already
-available.
-
-Keep in mind that pub *will* generate a lockfile after it does this. If the
-only version of some dependency in your cache happens to be old, this will lock
-your app to that version. The next time you are online, you will likely want to
-run [`pub upgrade`](pub-upgrade.html) to upgrade to a later version.