Merge pull request #959 from metabase/doc_edits

docs/getting-started.md

docs/images/AccountSetup.png

docs/images/AddDatabase.png

docs/images/AddQ.png

docs/images/Addnewdashboard.png

docs/images/Bookicon.png

docs/images/DashboardDropdown.png

docs/images/DashboardGridButton.png

docs/images/DashboardSuccess.png

docs/images/DashboardView.png

docs/images/DataReference.png

docs/images/DataReferenceTab.png

docs/images/DataTableExplore.png

docs/images/DatabaseConnected.png

docs/images/DatabaseView.png

docs/images/EditDashboard.png

docs/images/EditDashboardInterface.png

docs/images/Editmode.png

docs/images/GroupingFeature.png

docs/images/QueryInterfaceBar.png