Improve website onboarding: 2025 edition

• Make plans on the big issues (after having installed your first Tails)
  • Study other guides to figure out what their authors think is missing in our doc?
  • Redesign /doc/about/features (tails#18026)
  • Explain the basics of using Tails (#17725)
• Uninstalling issues
  • Use more consistent terminology in uninstalling... (#20491)
  • Document how to create a FAT or NTFS partition ... (#21136)
  • Split uninstalling from Tails in a dedicated page (#21135)
  • Document the new reset procedure in Windows 11 (#21132)
• Other smaller issues
  • Improve our documentation about Tor Browser (#19122)
  • Improve our support page based on the brainstor... (#15130)
  • Instruct people to use Tails Cloner to create a... (#17292)
  • Clarify that the installation process leaves tr... (#18910)