feat(pictograms): add new cities and new category

[dudley-ibm]

Closes #

{{closes missing city pictograms from issue #1 and new pictograms from #53}}

Changelog

New

• {{

• New Category: Public service

• New Pictograms and their (categories): firefighter (Public service)
  social--worker (Public service)
  teacher (Public service)
  police (Public service – moved from Enforcement)
  portland--building (Cities)
  seoul--gyeongbokgung-palace (Cities)

• }}

Changed

• {{Enforcement category changed to Government and Police pictogram moved from old Enforcement category to new Public service category}}

Removed

• {{removed thing}}

Testing / Reviewing

{{ These new pictograms, new category and renamed category should appear on both carbon design system site and IBM Design Language site }}

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[netlify]

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[andreancardona]

looks good!