Provide more information about templates

[AntonPetrov]

A user pointed out that the current UI does not provide sufficient detail about what organism the template came from, for example the following message:

Generated by R2DT using the DM_SSU_3D template provided by RiboVision

mentions the template ID but it's not clear where to find that it's from Drosophila melanogaster. It would be useful to have a tooltip or put the organism name in parentheses (when available - for Rfam templates there are no organism names for example). The data can be found in models.json.

Alternatively, one could dynamically generate a webpage for each template:
rnacentral.org/r2dt/template/dm_ssu_3d

showing some metadata and the 2D structure of the template itself. This is more work and more maintenance so could be done at a later stage.