improve basic query display for "run" mode

[mkroetzsch]

When running queries directly via "further results", the query view currently shows a text box and a button "run query". It would be better to change this as follows:

• The textbox and "run query" button are not shown.
• There is a control to show the query text. But it should not be editable and there should be no "run" button there either, because the query view currently cannot handle arbitrary SPARQL queries.
• There should be a link to open the query in the UI of query.wikidata.org. This is also good enough for editing.
• All of the controls ("show query" and link to query.wikidata.org) should occupy only very little space at the top, to avoid pushing the results down too far.