v3.0.0

• [BC] Update plugins configuration #155
  The plugin configuration has changed.
  RetinaJS configuration was in ghost-storage-cloudinary.rjs JSON
  property, while it's now wrapped into a plugins object.

Before:

{
    "storage": {
        "active": "ghost-storage-cloudinary",
        "ghost-storage-cloudinary": {
            "rjs": {
                "baseWidth": 960,
                "fireForget": true
            }
        }
    }
}

Now:

{
    "storage": {
        "active": "ghost-storage-cloudinary",
        "ghost-storage-cloudinary": {
            "plugins": {
                "retinajs": {
                    "baseWidth": 960,
                    "fireForget": true
                }
            }
        }
    }
}

• Drop NodeJS 14 and 16 support #172
• Update dependencies #159, #160, #161, #162, #166, #168, #173, #174, #176
• Create a new error off the original Ghost Internal Error #154
• Add manual integration testing #175