docs: add dmattia as a contributor for doc (lightdash#7121)

* docs: update README.md [skip ci]

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

---------

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

.all-contributorsrc

@@ -1165,6 +1165,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "dmattia",
+      "name": "David Mattia",
+      "avatar_url": "https://avatars.githubusercontent.com/u/8922077?v=4",
+      "profile": "https://github.com/dmattia",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -335,6 +335,7 @@ 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/ujwalkumar1995"><img src="https://avatars.githubusercontent.com/u/20976813?v=4?s=100" width="100px;" alt="Ujwal Kumar"/><br /><sub><b>Ujwal Kumar</b></sub></a><br /><a href="https://github.com/lightdash/lightdash/commits?author=ujwalkumar1995" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/nimit9"><img src="https://avatars.githubusercontent.com/u/37402791?v=4?s=100" width="100px;" alt="Nimit Haria"/><br /><sub><b>Nimit Haria</b></sub></a><br /><a href="https://github.com/lightdash/lightdash/commits?author=nimit9" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/tnightengale"><img src="https://avatars.githubusercontent.com/u/17347282?v=4?s=100" width="100px;" alt="Teghan Nightengale"/><br /><sub><b>Teghan Nightengale</b></sub></a><br /><a href="https://github.com/lightdash/lightdash/commits?author=tnightengale" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/dmattia"><img src="https://avatars.githubusercontent.com/u/8922077?v=4?s=100" width="100px;" alt="David Mattia"/><br /><sub><b>David Mattia</b></sub></a><br /><a href="https://github.com/lightdash/lightdash/commits?author=dmattia" title="Documentation">📖</a></td>
     </tr>
   </tbody>
 </table>