Update Package.json information

[sgobotta]

Depends on #18

Updates:

• Remove private repository attribute
• Add project description (similar to github homepage)
• add author: Cambá info@camba.coop
• Licence: GPL (same as master)
• update version to 0.0.0
• add keywords (similar to topics Edit description and topics to the github header #18)
• add repository

 "repository": {
    "type": "git",
    "url": "git+https://github.com/josx/ra-data-feathers.git"
  }

• add bugs

 "bugs": {
    "url": "https://github.com/Cambalab/vue-admin/issues"
  },
  "homepage": "https://github.com/Cambalab/vue-admin#readme",

• add publish commands