base: new landing page

* Removes boxes of the homepage.

* Adds new text entry.

* Realigns the header and footer.

Signed-off-by: Georgios Kokosioulis <georgios.kokosioulis@cern.ch>
deposit: extra boxes addition

* Adds references, relevance to HEP and extra comments boxes.

* New workflow task that passes the info to the Holding Pen via
  extra_data dict.

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: merge page range/article id fields

Signed-off-by: Pedro Gaudêncio <pedro.gaudencio@cern.ch>
deposit: report number form field addition

Signed-off-by: Pedro Gaudêncio <pedro.gaudencio@cern.ch>
deposit: thesis info regrouping

Signed-off-by: Pedro Gaudêncio <pedro.gaudencio@cern.ch>
deposit: proceedings info placeholder update

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
deposit: box height adjustments

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
config: DOI/arXiv database search prefixes

* Updates DOI/arXiv database search prefixes when used in CrossRef
  and arXiv Flask extensions.

Signed-off-by: Pedro Gaudêncio <pedro.gaudencio@cern.ch>