Bug 33505: Improve styling of scan index page

Bug 33505: Improve styling of scan index page

This patch makes some changes to the 'scan index' page.

* Updates second h1 heading "Scan index:" to h2 level heading "Scan index"
* Removes table from the search form
* Moves search index pull down and search term into one line
* Reorders options with search index first and search term after, matching
  the advanced search form
* Removes the catalog results toolbar from the top, card hold etc. are not needed
  here.
* Fixes doubled up id attribute: scan-index by turning one into scan-index-term.

To test:
* Go to advanced search in staff interface
* Activate 'More options'
* Check checkbox for scan indexes
* Switch to author (especially when using Elasticsearch)
* Search for C
* Check display, especially search options, options at the top of the page etc.
* Apply patch
* Verify changes listed above
* Regression test the normal search results, all should look the same with and without patch.
* If you think the scan index page is nicer now - sign off.

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>