Make all types of editing possible on the view page

[kjniemela]

All forms of editing should be possible from the view page, including:

• [x] editing the body text
• [ ] adding/removing tabs
• [ ] uploading gallery images (#37)
• [ ] all special tab types:
  • map editing
  • timeline editing
  • family tree editing
• [ ] editing tags
• [ ] maybe even editing the layout?