Documentation/gpu: add dedicated documentation for Intel display

Nowadays, the display support for drm/i915 and drm/xe is shared between
the drivers, even though the code is located under drm/i915/display.

The drm/i915 documentation has everything, including display topics, in
one huge page, while the drm/xe documentation is well-organized but
hardly mentions display. It's not great, to put it mildly.

Split out the Intel display documentation to a dedicated directory,
Documentation/gpu/intel-display. Also directly split the
functionality/feature documentation to dedicated pages to keep the main
index page high level and readable. We'll want to organize this further,
but just sort them alphabetically for starters.

Drop the boilerplate documentation sections that don't actually document
anything.

Cross-reference drm/i915, drm/xe, and intel-display.

Tested-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/21bfa7777eb0926eadd309d4c6f5c9cf48405cf0.1778235406.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

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