[openstreetmap-website] Remove 9.0 extension install instructions (#1105)

[Paul Norman]

PostgreSQL 9.0 is end of life, and having both extension install methods in documentation is often a source of confusion.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/1105

-- Commit Summary --

  * Remove 9.0 extension install instructions

-- File Changes --

    M INSTALL.md (8)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/1105.patch
https://github.com/openstreetmap/openstreetmap-website/pull/1105.diff

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/1105
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