pgsql: doc: Remove links to further reading from pgcrypto docs

doc: Remove links to further reading from pgcrypto docs

The pgcrypto docs contained a set of links for useful reading and
technical references. These sets of links were however not actively
curated and had stale content and dead links. Rather than investing
time into maintining these, this removes them altogether since there
are lots of resources online which are actively maintained.

Backpatch to all supported versions since these links have been in
the docs for a long time.

Reported-by: Hanefi Onaldi <hanefi.onaldi@microsoft.com>
Reviewed-by: Magnus Hagander <magnus@hagander.net>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/170774255387.3279713.2822272755998870925@wrigleys.postgresql.org
Backpatch-through: v12

Branch
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REL_15_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ac54734b24c5635c4e0c15c9989221774b065f62

Modified Files
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doc/src/sgml/pgcrypto.sgml | 66 ----------------------------------------------
1 file changed, 66 deletions(-)