add mkdocs

docs/widgets/services/mastodon.md

@@ -0,0 +1,14 @@
+---
+title: Mastodon
+description: Mastodon Widget Configuration
+---
+
+Use the base URL of the Mastodon instance you'd like to pull stats for. Does not require authentication as the stats are part of the public API endpoints.
+
+Allowed fields: `["user_count", "status_count", "domain_count"]`.
+
+```yaml
+widget:
+    type: mastodon
+    url: https://mastodon.host.name
+```