docs: add AlexGustafsson as a contributor for code, doc (#2090)

* docs: update README.md

* docs: update .all-contributorsrc

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>
Co-authored-by: Amir Zarrinkafsh <nightah@me.com>

.all-contributorsrc

@@ -491,6 +491,16 @@
       "contributions": [
         "security"
       ]
+    },
+    {
+      "login": "AlexGustafsson",
+      "name": "Alex Gustafsson",
+      "avatar_url": "https://avatars.githubusercontent.com/u/14974112?v=4",
+      "profile": "https://github.com/AlexGustafsson",
+      "contributions": [
+        "code",
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7

README.md

@@ -260,6 +260,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
   </tr>
   <tr>
     <td align="center"><a href="http://jonbayl"><img src="https://avatars.githubusercontent.com/u/30201351?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jon B. </b></sub></a><br /><a href="#security-jonbayl" title="Security">🛡️</a></td>
+    <td align="center"><a href="https://github.com/AlexGustafsson"><img src="https://avatars.githubusercontent.com/u/14974112?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Alex Gustafsson</b></sub></a><br /><a href="https://github.com/authelia/authelia/commits?author=AlexGustafsson" title="Code">💻</a> <a href="https://github.com/authelia/authelia/commits?author=AlexGustafsson" title="Documentation">📖</a></td>
   </tr>
 </table>