Update installation docs and add models quickstart aside

website/docs/usage/index.jade

@@ -12,6 +12,16 @@ p
     |  #[a(href="#source-ubuntu") Ubuntu], #[a(href="#source-osx") macOS/OS X]
     |  and #[a(href="#source-windows") Windows] for details.
 
++aside("Download models")
+    |  After installation you need to download a language model. For more info
+    |  and available models, see the #[+a("/docs/usage/models") docs on models].
+
+    +code.o-no-block.
+        python -m spacy.download en
+
+        >>> import spacy
+        >>> nlp = spacy.load('en')
+
 +h(2, "pip") pip
 
 p Using pip, spaCy releases are currently only available as source packages.
@@ -43,64 +53,6 @@ p
     |  #[+a("https://github.com/conda-forge/spacy-feedstock") this repository].
     |  Improvements and pull requests to the recipe and setup are always appreciated.
 
-+h(2, "models") Download models
-
-p
-    |  After installation you need to download a language model. Models for
-    |  English (#[code en]) and German (#[code de]) are available.
-
-+code(false, "bash").
-    python -m spacy.en.download all
-    python -m spacy.de.download all
-
-+aside-code("Examples", "bash").
-    # Install English tagger, parser and NER
-    python -m spacy.en.download parser
-
-    # Install English GloVe vectors
-    python -m spacy.en.download glove
-
-    # Upgrade/overwrite existing data
-    python -m spacy.en.download --force
-
-    # Check whether the model was successfully installed
-    python -c "import spacy; spacy.load('en'); print('OK')"
-
-p
-    |  The download command fetches about 1 GB of data which it
-    |  installs within the #[code spacy] package directory.
-
-+h(3, "custom-location") Download model to custom location
-
-p
-    |   You can specify where #[code spacy.en.download] and
-    |  #[code spacy.de.download] download the language model to using the
-    |  #[code --data-path] or #[code -d] argument:
-
-+code(false, "bash").
-    python -m spacy.en.download all --data-path /some/dir
-
-p
-    |  If you choose to download to a custom location, you will need to tell
-    |  spaCy where to load the model from in order to use it. You can do this
-    |  either by calling #[code spacy.util.set_data_path()] before calling
-    |  #[code spacy.load()], or by passing a #[code path] argument to the
-    |  #[code spacy.en.English] or #[code spacy.de.German] constructors.
-
-+h(3, "models-manual") Download models manually
-
-p
-    |  As of v1.6, the models and word vectors are also available as direct
-    |  downloads from GitHub, attached to the #[+a(gh("spaCy") + "/releases") releases] as #[code .tar.gz] archives.
-
-p
-    |  To install the models manually, first find the default data path. You can
-    |  use #[code spacy.util.get_data_path()] to find the directory where spaCy
-    |  will look for its models, or change the default data path with
-    |  #[code spacy.util.set_data_path()]. Then simply unpack the archive and
-    |  place the contained folder in that directory. You can now load the models
-    |  via #[code spacy.load()].
-
 +h(2, "source") Compile from source
 
 p