The theory is that nowadays most themes are responsive, so there's
no need for custom "mobile detection" logic anymore. Try to validate
the theory starting with Android devices.

The WP-Supercache Apache caching will anyway cover NGINX
requests for 300s.

In case it's a tmpfs.

Specifically fix the cached files path.

Drops the 'must-revalidate' bit, which prevents serving stale pages,
and sets a longer max-age to match the edge NGINX caching ttl.

Attempts to fix issue #114.

Avoids an extra SQL lookup on every request (a drop in the
ocean, but still).

Without this package PHP can't generate OpenSSL keys apparently.

Using what is hopefully the right format for the tx.allowed_request_content_type
configuration variable.

Only comment changes, illustrating the new defaults.

This reverts commit 9c69d4de.

This reverts commit 4acd8455.

It shouldn't be necessary in our setup, and it just makes keys
needlessly longer.

Seems like it might be needed by wp2pgpmail.