hardware_product specification field needs a larger text box

[karenetheridge]

The 'specification' field in hardware_product is a json blob, so it would be helpful to display its value in a larger textbox, or render it as formatted json for enhanced readability (and editing). It would also be useful to syntax-check any edits as valid json in the textbox.

e.g. see 'smci-2u-compute-512g-16-sas-1tb'

related to #213, #237.

[karenetheridge]

Update: the data doesn't even render at all now, so while this is a change, it's not really a forward change.