Split Create team page into 3

Review app pages:

• https://dm-create-backend-team-pages.about-src.gitlab.com/handbook/engineering/development/dev/create-source-code-be/index.html
• https://dm-create-backend-team-pages.about-src.gitlab.com/handbook/engineering/development/dev/create-knowledge-be/index.html
• https://dm-create-backend-team-pages.about-src.gitlab.com/handbook/engineering/development/dev/create-editor-be/index.html
• https://dm-create-backend-team-pages.about-src.gitlab.com/handbook/product/categories/#create-stage