Overview table contained items - by starting letter

[emanuelaepure10]

Please follow the template below and provide at least information for the first 4 sections

Background and Motivation

Would be nice that in each page where there is a table to be able to see the items by the starting letter of the label.

Proposed change

would be nice to see them as in the example bellow: https://data.un.org/Glossary.aspx?d=PopDivG https://stats.oecd.org/glossary/ https://www.who.int/data/gho/indicator-metadata-registry https://inspire-regadmin.jrc.ec.europa.eu/dataspecification/CatalogueINSPIREObjects.action

Additional information

In this way, the contained items could be seen in 3 ways:

1. as a table as it is now
2. by starting letter
3. by d3.js tree graph (when available)

[arantzaetxebarria]

Take into account what is described in https://github.com/ec-jrc/re3gistry/issues/157

[jescriu]

After having analysed this enhancement the JRC INSPIRE team has decided to postpone its potential implementation waiting for the upcoming discussion on the future of the Re3gistry open-source software. For the above-mentioned reason, this item is temporarily closed.