docs: add iMac7 as a contributor for code (lightdash#7650)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

---------

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

Author: allcontributors[bot]

Diff for: .all-contributorsrc

@@ -1228,6 +1228,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "iMac7",
+      "name": "iMac",
+      "avatar_url": "https://avatars.githubusercontent.com/u/76876702?v=4",
+      "profile": "https://github.com/iMac7",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

Diff for: README.md

@@ -344,6 +344,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/karan0handa"><img src="https://avatars.githubusercontent.com/u/79533543?v=4?s=100" width="100px;" alt="Karan Handa"/><br /><sub><b>Karan Handa</b></sub></a><br /><a href="https://github.com/lightdash/lightdash/commits?author=karan0handa" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/rohitverma007"><img src="https://avatars.githubusercontent.com/u/3745109?v=4?s=100" width="100px;" alt="Rohit Verma"/><br /><sub><b>Rohit Verma</b></sub></a><br /><a href="https://github.com/lightdash/lightdash/commits?author=rohitverma007" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="http://dwitkowski.eu"><img src="https://avatars.githubusercontent.com/u/43667775?v=4?s=100" width="100px;" alt="David Witkowski"/><br /><sub><b>David Witkowski</b></sub></a><br /><a href="https://github.com/lightdash/lightdash/commits?author=chodera" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/iMac7"><img src="https://avatars.githubusercontent.com/u/76876702?v=4?s=100" width="100px;" alt="iMac"/><br /><sub><b>iMac</b></sub></a><br /><a href="https://github.com/lightdash/lightdash/commits?author=iMac7" title="Code">💻</a></td>
     </tr>
   </tbody>
 </table>