[openstreetmap-website] INSTALL.md needs to mention the need for a js runtime (#593)

[Tom Hughes]

Fixed in 11d8dc59d43997ad7d4b35818087200e42399000.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/593#issuecomment-29654017
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