dev-manual/start.rst: remove basic setup for hash equivalence

Quoting Alexander Kanavin [1]:

> 1. BB_HASHSERVE and BB_SIGNATURE_HANDLER do not set up or start a
> server, they set up the hash equivalence client built into bitbake.
>
> 2. The above client configuration (used by poky) also starts a private
> server that is specific to a particular build directory. So hash equiv
> information would not be shared between multiple build directories,
> and this will cause sstate mismatches (as reported in the bug), if
> sstate is shared.

This setup does not shed light on the potential of the hash equivalence
feature. So for now, remove this basic setup, and later rework the
concepts (or create a new) document that explains how to set up a hash
equivalence server shared between builds.

[1]: https://lore.kernel.org/r/CANNYZj_kvLsZG3sgH+nPu9B=pqWBU785w0SGHGdQqB4UW-DtmA@mail.gmail.com

Suggested-by: Alexander Kanavin <alex.kanavin@gmail.com>
(From yocto-docs rev: 231fc9e710ab34db60263f8ae01d4f5970579203)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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