Trim activities with Klimat descriptions

[dblock]

Klimat adds a bunch of info that users might not want to see reposted.

{
  "attachments": [
    {
      "fallback": "\"Didn't feel like running today\" run  via <@U010SPGV525>, 2.6mi 25m35s 9m50s/mi",
      "title": "\"Didn't feel like running today\" run ",
      "title_link": "https://www.strava.com/activities/...",
      "text": "<@name> on Tuesday, May 12, 2020 at 06:05 PM\n\nStart weather: Clear / 64°F / Feels like 64°F ☀️ \nHumidity 37%, / Wind 7mph from W\nEnd weather: Clear / 63°F / Feels like 63°F ☀️ \nHumidity 39%, Wind 6mph from WSW\n-- Weather added by Klimat.app --",
      "image_url": "https://slava.playplay.io/api/maps/5ebb308dd3018b01013f50d2.png",
      "fields": [
        {
          "title": "Type",
          "value": "Run 🏃",
          "short": true
        },
        {
          "title": "Distance",
          "value": "2.6mi",
          "short": true
        },
        {
          "title": "Moving Time",
          "value": "25m35s",
          "short": true
        },
        {
          "title": "Elapsed Time",
          "value": "33m42s",
          "short": true
        },
        {
          "title": "Pace",
          "value": "9m50s/mi",
          "short": true
        },
        {
          "title": "Speed",
          "value": "6.1mph",
          "short": true
        },
        {
          "title": "Elevation",
          "value": "228.3ft",
          "short": true
        },
        {
          "title": "Max Speed",
          "value": "8.7mph",
          "short": true
        },
        {
          "title": "Heart Rate",
          "value": "123.4bpm",
          "short": true
        },
        {
          "title": "Max Heart Rate",
          "value": "145.0bpm",
          "short": true
        }
      ],
      "author_name": "...",
      "author_link": "https://www.strava.com/athletes/...",
      "author_icon": "https://dgalywyr863hv.cloudfront.net/pictures/athletes/.../6653907/2/medium.jpg"
    }
  ],
  "channel": "C01124GKJP6",
  "ts": "1589325965.151300",
  "as_user": true
}