Installation-guide cleanup

  * Various small removals / updates / amendments in chapter 3,
    most of them concerning outdated information.
  * Extended the "Devices Requiring Firmware" section.
  * Rewrote large parts of the "Avoid Proprietary or Closed Hardware"
    section.
  * Rewrote the "Hardware Compatibility" section.
  * Amended the "Network Settings" section.
  * Rewrote the "Pre-Partitioning for Multi-Boot Systems" section
    to bring it up to date with the current d-i features and make it
    easier to read for beginners.
  * Rewrote the "Pre-Installation Hardware and Operating System Setup"
    section to bring it up to date for modern hardware.

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