refactor landing box

[d2fong]

The design, general code quality, and performance of the landing box page need to be improved.

[jvwong]

See #869 (comment)

[jvwong]

Just so this is not lost:

1. This commit inadvertently removed the 'Official Symbol' field. This is part of refactor landing box #875.

2. Same commit inadvertently removed the 'View Interactions Between Entities' link parameter. Also will be addressed in refactor landing box #875.

3. We should use Gene Cards recommended link instead:

Linking to particular GeneCards
If you are a web developer and you want to make links to particular GeneCards, use
"https://www.genecards.org/cgi-bin/carddisp.pl?gene=XXX" (with XXX being the gene symbol).

To link using an external id, use "https://www.genecards.org/cgi-bin/carddisp.pl?id=YYY"
(where YYY is a UniProt accession, EntrezGene id, Ensembl id, or HGNC id).
Optionally, a source for the id can be specified by adding "&id_type=" to the url. The possible types are "uniprot", "entrezgene", "ensembl", and "hgnc". To avoid confusion, it is strongly recommended to use the id_type parameter, especially for numeric ids.