message: doc: add font features/axes to the schema
  Add entries to the schema for font features and axes
  * [x] Closes
diff: "type": "integer"
  }
  ]
  + },
  + "features": {
  + "description": "Sets the DWrite font features for the given font. For example, { \"ss01\": 1, \"liga\":0 } will enable ss01 and disable ligatures.",
  + "type": "object",
  + "patternProperties": {
  + "^(([A-Za-z0-9]){4})$": { "type": "integer" }
  + },
  + "additionalProperties": false
  + },
  + "axes": {
  + "description": "Sets the DWrite font axes for the given font. For example, { \"wght\": 200 } will set the font weight to 200.",
  + "type": "object",
  + "patternProperties": {
  + "^([A-Za-z]{4})$": { "type": "number" }
  + },
  + "additionalProperties": false
  }
  },
  "type": "object"
  