Revert "Assets management documentation" (#59)

Makefile

@@ -2,7 +2,7 @@
 #
 # It's auto-generated by sonata-project/dev-kit package.
 
-.PHONY: test docs assets
+.PHONY: test docs
 
 all:
 	@echo "Please choose a task."
@@ -20,7 +20,3 @@ test:
 
 docs:
 	cd Resources/doc && sphinx-build -W -b html -d _build/doctrees . _build/html
-
-assets:
-	cd Resources/assets_src && npm install
-	cd Resources/assets_src && gulp

Resources/doc/index.rst

@@ -10,4 +10,3 @@ Reference Guide
 
    reference/introduction
    reference/installation
-   reference/assets

Resources/doc/reference/introduction.rst

@@ -7,28 +7,6 @@ This small introduction will try to explain the basics concepts behind the
 A Dashboard
 -----------
 
-A ``Dashboard`` is a collection of blocks, actually of block containers, containing the
-blocks required to manage its content.
 
 A Block
 -------
-
-The ``SonataDashboardBundle`` does not know how to manage content, actually there is
-no content management. This part is delegated to services. The bundle only
-manages references to the service required by a dashboard. Reference information is
-stored in a ``Block``.
-
-A block is a small unit, it contains the following information:
-
- - service id
- - position
- - settings used by the service
-
-Each block service must implement the ``Sonata\PageBundle\Block\BlockServiceInterface``
-which defines a set of functions to create so the service can be integrated
-nicely with editing workflow. The important information is that a block service
-must always return a ``Response`` object.
-
-By default the ``SonataDashboardBundle`` is shipped with a core block service:
-
- - sonata.dashboard.block.container      : Block container