Add/Activate basic visualization tools to LDM

[TBoonX]

See #19

Comment from Javad: We discussed this in detail. When the actual data does not come to the LDM data portal, it would not be possible to have visualization there. Instead we discussed to have some previews of the data to be ingested as a part of metadata harvesting as well as providing some visualization on the original repos and link to them from the data portal.

[TBoonX]

After we have the list of provided visualizations for external services of NOMAD and DSMS we could start with this task and include them.