docs: add joshuakgoldberg as a contributor for ideas (#137)

Adds @JoshuaKGoldberg as a contributor for ideas.

This was requested by JoshuaKGoldberg [in this
comment](#52 (comment))

---------

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

.all-contributorsrc

@@ -54,7 +54,8 @@
         "code",
         "doc",
         "maintenance",
-        "infra"
+        "infra",
+        "ideas"
       ]
     },
     {

README.md

@@ -107,7 +107,7 @@ Many thanks to [@ibezkrovnyi](https://github.com/ibezkrovnyi) for creating the i
       <td align="center" valign="top" width="14.28%"><a href="https://danielnagy.me"><img src="https://avatars.githubusercontent.com/u/1622446?v=4?s=100" width="100px;" alt="Daniel Nagy"/><br /><sub><b>Daniel Nagy</b></sub></a><br /><a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/issues?q=author%3Adaniel-nagy" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/TkDodo"><img src="https://avatars.githubusercontent.com/u/1021430?v=4?s=100" width="100px;" alt="Dominik Dorfmeister"/><br /><sub><b>Dominik Dorfmeister</b></sub></a><br /><a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/commits?author=TkDodo" title="Documentation">📖</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ibezkrovnyi"><img src="https://avatars.githubusercontent.com/u/1188919?v=4?s=100" width="100px;" alt="Igor Bezkrovnyi"/><br /><sub><b>Igor Bezkrovnyi</b></sub></a><br /><a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/issues?q=author%3Aibezkrovnyi" title="Bug reports">🐛</a> <a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/commits?author=ibezkrovnyi" title="Code">💻</a> <a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/commits?author=ibezkrovnyi" title="Documentation">📖</a> <a href="#maintenance-ibezkrovnyi" title="Maintenance">🚧</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="http://www.joshuakgoldberg.com/"><img src="https://avatars.githubusercontent.com/u/3335181?v=4?s=100" width="100px;" alt="Josh Goldberg ✨"/><br /><sub><b>Josh Goldberg ✨</b></sub></a><br /><a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/issues?q=author%3AJoshuaKGoldberg" title="Bug reports">🐛</a> <a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/commits?author=JoshuaKGoldberg" title="Code">💻</a> <a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/commits?author=JoshuaKGoldberg" title="Documentation">📖</a> <a href="#maintenance-JoshuaKGoldberg" title="Maintenance">🚧</a> <a href="#infra-JoshuaKGoldberg" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="http://www.joshuakgoldberg.com/"><img src="https://avatars.githubusercontent.com/u/3335181?v=4?s=100" width="100px;" alt="Josh Goldberg ✨"/><br /><sub><b>Josh Goldberg ✨</b></sub></a><br /><a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/issues?q=author%3AJoshuaKGoldberg" title="Bug reports">🐛</a> <a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/commits?author=JoshuaKGoldberg" title="Code">💻</a> <a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/commits?author=JoshuaKGoldberg" title="Documentation">📖</a> <a href="#maintenance-JoshuaKGoldberg" title="Maintenance">🚧</a> <a href="#infra-JoshuaKGoldberg" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="#ideas-JoshuaKGoldberg" title="Ideas, Planning, & Feedback">🤔</a></td>
     </tr>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://twitter.com/_RussellDavis"><img src="https://avatars.githubusercontent.com/u/551404?v=4?s=100" width="100px;" alt="Russell Davis"/><br /><sub><b>Russell Davis</b></sub></a><br /><a href="https://github.com/JoshuaKGoldberg/eslint-plugin-expect-type/commits?author=russelldavis" title="Code">💻</a></td>