Documentation Meta Ticket

[svx]

List with items to change and/or improve related to documentation

Branch: https://github.com/plone/guillotina/tree/docs-new-theme

• [X] Move design docs out of development and into the about chapter.
• [ ] Add Key Points
• [X] Move component architecture docs out of development and into the about chapter
• [ ] Remove double install instructions (training and development) have them once and link/reference
• [ ] PR for dev/training install #899
• [ ] Add Agolia for search