docs: add rubiesonthesky as a contributor for ideas (#2508)

Adds @rubiesonthesky as a contributor for ideas.

This was requested by JoshuaKGoldberg [in this
comment](#2504 (comment))

---------

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -119,7 +119,8 @@
         "maintenance",
         "tool",
         "code",
-        "test"
+        "test",
+        "ideas"
       ]
     },
     {

README.md

@@ -86,7 +86,7 @@ Thanks! 💖
       <td align="center" valign="top" width="14.28%"><a href="https://orionna.me/"><img src="https://avatars.githubusercontent.com/u/85230052?v=4?s=100" width="100px;" alt="orionna319"/><br /><sub><b>orionna319</b></sub></a><br /><a href="https://github.com/JoshuaKGoldberg/TypeStat/issues?q=author%3Aorionna319" title="Bug reports">🐛</a></td>
     </tr>
     <tr>
-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/rubiesonthesky"><img src="https://avatars.githubusercontent.com/u/2591240?v=4?s=100" width="100px;" alt="rubiesonthesky"/><br /><sub><b>rubiesonthesky</b></sub></a><br /><a href="https://github.com/JoshuaKGoldberg/TypeStat/issues?q=author%3Arubiesonthesky" title="Bug reports">🐛</a> <a href="#maintenance-rubiesonthesky" title="Maintenance">🚧</a> <a href="#tool-rubiesonthesky" title="Tools">🔧</a> <a href="https://github.com/JoshuaKGoldberg/TypeStat/commits?author=rubiesonthesky" title="Code">💻</a> <a href="https://github.com/JoshuaKGoldberg/TypeStat/commits?author=rubiesonthesky" title="Tests">⚠️</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/rubiesonthesky"><img src="https://avatars.githubusercontent.com/u/2591240?v=4?s=100" width="100px;" alt="rubiesonthesky"/><br /><sub><b>rubiesonthesky</b></sub></a><br /><a href="https://github.com/JoshuaKGoldberg/TypeStat/issues?q=author%3Arubiesonthesky" title="Bug reports">🐛</a> <a href="#maintenance-rubiesonthesky" title="Maintenance">🚧</a> <a href="#tool-rubiesonthesky" title="Tools">🔧</a> <a href="https://github.com/JoshuaKGoldberg/TypeStat/commits?author=rubiesonthesky" title="Code">💻</a> <a href="https://github.com/JoshuaKGoldberg/TypeStat/commits?author=rubiesonthesky" title="Tests">⚠️</a> <a href="#ideas-rubiesonthesky" title="Ideas, Planning, & Feedback">🤔</a></td>
     </tr>
   </tbody>
 </table>