As we merge with upstream and by that keep refining the Postgres
planner, legacy planner is no longer a suitable name. This changes
all variations of the spelling (legacy planner, legacy optimizer,
legacy query optimizer etc) to say "Postgres" rather than "legacy".
Reviewed-by: NVenkatesh Raghavan <vraghavan@pivotal.io>
Reviewed-by: NDavid Yozie <dyozie@pivotal.io>
Reviewed-by: NGeorgios Kokolatos <gkokolatos@pivotal.io>

Commit 17f9b7f070dbe17b2844a8b4dd428 in the pgweb repository removed
the /static/ portion on all doc URLs, leaving a redirect in place. To
avoid incurring a needless redirect, remove the /static/ part in the
links to the PostgreSQL documentation.

The /static/ URLs stem from a time when there were interactive docs
that had comment functionality. These docs were removed a very long
time ago, but the static differentiator was left in place until now.

Reviewed-by: Mel Kiyama

s/interconect/interconnect/

* Clarify gpdb implementation

* Minor updates

* Add column storage info

* Fix typo

* Edits form Mel

* Fix minor typo

* Clarifying table compression

* More on AO storage

* Make append-optimized lower case

* Make the 10 Gb optional

* removing/rewording interconnect docs as only UDPIFC is supported in 5.0.0

* update docs to return TCP as valid interconnect for 5.0.0

* adding graphics directory for adminguide

* updating source to use local /graphics dir

* adding missing graphics

* adding ditamap for client docs; removing some extraneous landing pages; adding local graphics