feat(cmd): add pin/unpin commands

commands/unpin.js

@@ -0,0 +1,18 @@
+const axios = require('axios');
+
+exports.runQuery = function (matrixClient, room, userInput, registrar) {
+  axios({
+    method: 'POST',
+    url: `${registrar.config.fediverse}/api/v1/statuses/${userInput}/unpin`,
+    headers: { Authorization: `Bearer ${registrar.config.fediverseToken}` },
+  }).then((response) => {
+    matrixClient.sendHtmlNotice(room.roomId,
+          '',
+          `Unpinned:
+          <blockquote>${registrar.config.fediverse}/${userInput}`);
+  })
+    .catch((e) => {
+      matrixClient.sendHtmlNotice(room.roomId,
+        '', `${e}`);
+    });
+};