Include "Parent type" column on the Terms page

[jezcope]

The table on the Terms page on the website is quite confusing because it omits the information on which schema.org Type each term comes from. For example identifier appears in the list twice, once for schema:Thing and once for schema:Person. This info is present in the first column of the crosswalk.csv file already used to generate the page, so it should be a case of including this column when generating the table.

[tmorrell]

This is partially implemented in https://github.com/codemeta/codemeta.github.io/blob/hugo/content/terms.Rmd by splitting out the Person and Thing terms into a separate table, which would help a lot with the confusion. However, it doesn't seem to be reflected in the live site. My guess is the live site hasn't been updated?

[bact]

#77 reimplements what I believed @tmorrell has described above, please kindly review.

[bact]

The Terms page now separated Thing, Person, Review, Role, see:
https://codemeta.github.io/terms/#schemaorg-thing-terms

The software terms are still grouped together.