feat(gardening): update new spin contribute workshop page; spinnaker … (#2067)
feat(gardening): update new spin contribute workshop page; spinnaker … (#2067)

* feat(gardening): update new spin contribute workshop page; spinnaker install

* copy edits

Co-authored-by: Aimee Ukasick <3c8b7e44b37fafeca4462075424c6b3494b45c9d@gmail.com>
spinnaker/spinnaker.github.io,spinnaker/spinnaker.github.io,spinnaker/spinnaker.github.io