doc: Remove the patman documentation

The full patman manual now lives with the standalone patch-manager
package, making the 1000-line copy in the tree redundant.

Remove the in-tree manual, its README and the doc/develop/patman.rst
toctree page.

The sending-patches guide already introduces patman, so point it at the
patch-manager package instead of the now-dead ':doc:' cross-reference
and, with the manual gone, add a couple of lines on how the tool works.
Point the SPI howto at that guide too, rather than repeating the install
details.

Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>

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