single dataset/session badges to 2 badges smaller badges. Rename 'underembargo' badge to rescticted access

change the layout of the landing page with experimental report and experimental data one after the other.

reformat the code in order to better the MVC model. Use events to handles race course beteen the 2 async calls to datacite and smis. It fixes #28

change the header on the ajax call to retrieve all the data from datacite. Ajust the reading of the data from the JSON because the fields have different name and the json structure is different.

Set the new layout for the doi alnding page. Change the bootstrap version due to badly supported card-footer class

fix layout in case of an error in the doi landing page. Fix layout from the welcome-page in case of errors.