Drop all 00-INDEX files from Documentation/

This is a respin with a wider audience (all that get_maintainer returned)
and I know this spams a *lot* of people. Not sure what would be the correct
way, so my apologies for ruining your inbox.

The 00-INDEX files are supposed to give a summary of all files present
in a directory, but these files are horribly out of date and their
usefulness is brought into question. Often a simple "ls" would reveal
the same information as the filenames are generally quite descriptive as
a short introduction to what the file covers (it should not surprise
anyone what Documentation/sched/sched-design-CFS.txt covers)

A few years back it was mentioned that these files were no longer really
needed, and they have since then grown further out of date, so perhaps
it is time to just throw them out.

A short status yields the following _outdated_ 00-INDEX files, first
counter is files listed in 00-INDEX but missing in the directory, last
is files present but not listed in 00-INDEX.

List of outdated 00-INDEX:
Documentation: (4/10)
Documentation/sysctl: (0/1)
Documentation/timers: (1/0)
Documentation/blockdev: (3/1)
Documentation/w1/slaves: (0/1)
Documentation/locking: (0/1)
Documentation/devicetree: (0/5)
Documentation/power: (1/1)
Documentation/powerpc: (0/5)
Documentation/arm: (1/0)
Documentation/x86: (0/9)
Documentation/x86/x86_64: (1/1)
Documentation/scsi: (4/4)
Documentation/filesystems: (2/9)
Documentation/filesystems/nfs: (0/2)
Documentation/cgroup-v1: (0/2)
Documentation/kbuild: (0/4)
Documentation/spi: (1/0)
Documentation/virtual/kvm: (1/0)
Documentation/scheduler: (0/2)
Documentation/fb: (0/1)
Documentation/block: (0/1)
Documentation/networking: (6/37)
Documentation/vm: (1/3)

Then there are 364 subdirectories in Documentation/ with several files that
are missing 00-INDEX alltogether (and another 120 with a single file and no
00-INDEX).

I don't really have an opinion to whether or not we /should/ have 00-INDEX,
but the above 00-INDEX should either be removed or be kept up to date. If
we should keep the files, I can try to keep them updated, but I rather not
if we just want to delete them anyway.

As a starting point, remove all index-files and references to 00-INDEX and
see where the discussion is going.

Signed-off-by: Henrik Austad <henrik@austad.us>
Acked-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Just-do-it-by: Steven Rostedt <rostedt@goodmis.org>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Paul Moore <paul@paul-moore.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: [Almost everybody else]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/powerpc/00-INDEX

@@ -1,34 +0,0 @@
-Index of files in Documentation/powerpc.  If you think something about
-Linux/PPC needs an entry here, needs correction or you've written one
-please mail me.
-                                        Cort Dougan (cort@fsmlabs.com)
-
-00-INDEX
-	- this file
-bootwrapper.txt
-	- Information on how the powerpc kernel is wrapped for boot on various
-	  different platforms.
-cpu_features.txt
-	- info on how we support a variety of CPUs with minimal compile-time
-	options.
-cxl.txt
-	- Overview of the CXL driver.
-eeh-pci-error-recovery.txt
-	- info on PCI Bus EEH Error Recovery
-firmware-assisted-dump.txt
-	- Documentation on the firmware assisted dump mechanism "fadump".
-hvcs.txt
-	- IBM "Hypervisor Virtual Console Server" Installation Guide
-mpc52xx.txt
-	- Linux 2.6.x on MPC52xx family
-pmu-ebb.txt
-	- Description of the API for using the PMU with Event Based Branches.
-qe_firmware.txt
-	- describes the layout of firmware binaries for the Freescale QUICC
-	  Engine and the code that parses and uploads the microcode therein.
-ptrace.txt
-	- Information on the ptrace interfaces for hardware debug registers.
-transactional_memory.txt
-	- Overview of the Power8 transactional memory support.
-dscr.txt
-	- Overview DSCR (Data Stream Control Register) support.