Build modified streamline images

The official image from streamline does not currently work for the arm64
platform. As a temporary measure, the source code and docker build scripts
have been lifted from the official images and are used to build locally.

Some additional modifications are made to reduce overall image size, these
are documented in docker/README.md

docker/streamline-src/public/elite/bower_components/datatables-plugins/api/column().title().js

@@ -0,0 +1,21 @@
+/**
+ * This plug-in will read the text from the header cell of a column, returning
+ * that value.
+ *
+ *  @name column().title()
+ *  @summary Get the title of a column
+ *  @author Alejandro Navarro
+ *  @requires DataTables 1.10+
+ *
+ * @returns {String} Column title
+ *
+ *  @example
+ *    // Read the title text of column index 3
+ *    var table = $('#example').DataTable();
+ *    table.column( 3 ).title();
+ */
+
+$.fn.dataTable.Api.register( 'column().title()', function () {
+    var colheader = this.header();
+    return $(colheader).text().trim();
+} );