ODPSH-95: layout changes for search results

ckanext/odsh/i18n/de/LC_MESSAGES/ckanext-odsh.mo

ckanext/odsh/i18n/de/LC_MESSAGES/ckanext-odsh.po

ckanext/odsh/plugin.py

ckanext/odsh/public/odsh.css

ckanext/odsh/public/odsh_header.css

ckanext/odsh/templates/development/snippets/pagination.html

ckanext/odsh/templates/footer.html

ckanext/odsh/templates/header.html

ckanext/odsh/templates/package/search.html

ckanext/odsh/templates/page.html

ckanext/odsh/templates/snippets/package_item.html

ckanext/odsh/templates/snippets/search_box.html