Improvements for CFDE Content Registry Integration

[u8sand]

To accomplish CFDE content registry integration: MaayanLab/update-content-registry#1
A few changes would need to be made:

• potentially the ability to filter fields besides "id"/"label" which appear in the metadata of the KG
• "iframe-ready" rendering mode -- things like the header and footer can be removed so that it looks good in the cfde site. For example: https://app.nih-cfde.org/chaise/record/#1/CFDE:gene/nid=1 -- is from https://mii.podvis.org/cfde-ge1/#/gene_tissues?gencode_id=ENSG00000000419&width=1200&height=450&numTopTissues=10