docs: add @theUnmutual as a contributor

.all-contributorsrc

@@ -440,6 +440,15 @@
       "contributions": [
         "translation"
       ]
+    },
+    {
+      "login": "theUnmutual",
+      "name": "Unmutual",
+      "avatar_url": "https://avatars.githubusercontent.com/u/22374635?v=4",
+      "profile": "https://github.com/theUnmutual",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7

CONTRIBUTORS.md

@@ -66,6 +66,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/Chantalbijoux"><img src="https://avatars.githubusercontent.com/u/39673694?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Chantal Lapointe</b></sub></a><br /><a href="#translation-Chantalbijoux" title="Translation">🌍</a></td>
     <td align="center"><a href="https://github.com/Irapeke"><img src="https://avatars.githubusercontent.com/u/39604334?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Irapeke</b></sub></a><br /><a href="#translation-Irapeke" title="Translation">🌍</a></td>
     <td align="center"><a href="https://github.com/marckiesel"><img src="https://avatars.githubusercontent.com/u/39653780?v=4?s=100" width="100px;" alt=""/><br /><sub><b>marckiesel</b></sub></a><br /><a href="#translation-marckiesel" title="Translation">🌍</a></td>
+    <td align="center"><a href="https://github.com/theUnmutual"><img src="https://avatars.githubusercontent.com/u/22374635?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Unmutual</b></sub></a><br /><a href="https://github.com/freesewing/freesewing/commits?author=theUnmutual" title="Documentation">📖</a></td>
   </tr>
 </table>