The README had grown into one long page where the basic flashing
workflow was buried between VIP, multi-programmer, ramdump, kickstart,
WSL2 and raw sector guides. Keep only the generic material in the
README and move each specialised workflow into its own file under
docs/, linked from a new "Documentation" index. The moved text is
unchanged apart from heading levels and two cross-references.
Signed-off-by: Igor Opaniuk <igor.opaniuk@oss.qualcomm.com>
