Restructure the documentation on Mac support

• Create a single page called “Using Tails on a Mac” on (doc/first_steps/mac) to centralize all the information we have about how Tails works on Mac.
  • Insert it in the documentation index between “Upgrading” and “Start Tails”.
  • Link it from “Start Tails!”.
  • Rename the “Apple hardware” section of the “Know issues” page as “Mac” and limit it to a single sentence pointing to “Using Tails on a Mac”.
  • Move the page “Manually installing onto a USB stick for Mac” under “Using Tails on a Mac” in the documentation index.
  • Add an introduction to “Manually installing onto a USB stick for Mac” that summarizes its limitations and points back to “Using Tails on a Mac”.
  • Remove the end notes listing Mac models in “Manually installing onto a USB stick for Mac”.
  • Ask for review of our page to people knowledgeable about Mac.
  • Ideas of content for the page “Using Tails on a Mac”:
    • Disclaimer, we don’t know much about Mac. Please report your findings.
    • Link to the online list of Macs per generation and firmware version.
    • Tails does not work on PowerPC.
    • Try burning a DVD first and see if this works.
    • If you don’t have a DVD try a USB stick installed using Tails Installer. Create that from a PC if needed.
    • Install rEFIit and explain how to desinstall it.
    • On some models, a USB stick created with Tails Installer works with rEFIt.
    • Mention that “MAC USB Installer” and others are likely not to work either. Otherwise please tell us. If it work, be careful as it might break some security features.
    • You can try the instructions for “Manually installing onto a USB stick for Mac” if you really want a USB stick but it will be without persistence.

Blueprint: https://tails.boum.org/blueprint/support_page/

Feature Branch: bitingbird:doc/6319-mac

Parent Task: #15130

Related issues

• Related to #7147 (closed)
• Related to #11682 (closed)
• Related to #15292 (closed)

Original created by @sajolida on 6319 (Redmine)