Schema improvements

[shaedrich]

• basic.pronouns
• portfolio: Similar to profiles (otherwise, profiles could be renamed to something more general and there could be a type field ("profile", "portfolio", "blog", etc.))
• contractType for work: There are several different options:
  • permanently employed/salaried
  • freelancer
  • full-time/part-time
  • internship
  • student job
  • fixed-term
  • voluntary service
• Markdown fields (formatted text):
  • work.*.highlights
  • work.*.summary
  • volunteer.*.highlights
  • volunteer.*.summary
  • project.*.highlights
  • project.*.description
• Reference types
  • Turn links into an object ({ "type": "url", "value": "https://…" }) and add references to other fields (#422, #426; e.g. { "type": "doi", "value": "doi:10.1000/182" } or { "type": "isbn", "value": "978-3-7502-4718-5" } or { "type": "fedi", "value": "@username@domain.tld" })

[OddDev]

Good suggestions! I'd probably add basics.title to the list