[Tile-serving] [openstreetmap/osm2pgsql] Update docs, point to new web site (#1296)

[Jochen Topf]

Some documentation has moved to the new web site. The README.md now
points to that. Also some misc updates here or there.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1296

-- Commit Summary --

  * Update docs, point to new web site

-- File Changes --

    D README (1)
    M README.md (26)
    A docs/README.md (4)
    D docs/flex-advanced-topics.md (97)
    D docs/flex.md (404)
    D docs/gazetteer.md (7)
    D docs/lua-lib.md (75)
    M docs/osm2pgsql.md (2)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1296.patch
https://github.com/openstreetmap/osm2pgsql/pull/1296.diff

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