Add StopGifs to description

[akkoma] / priv / es-mappings / activity.json

{
  "mappings": {
    "properties": {
      "_timestamp": {
        "type": "date",
        "index": true
      },
      "instance": {
        "type": "keyword"
      },
      "content": {
        "type": "text"
      },
      "hashtags": {
        "type": "keyword"
      },
      "user": {
        "type": "text"
      }
    }
  }
}