docs: add birkskyum as a contributor for ideas (#2163)

Adds @birkskyum as a contributor for ideas.

This was requested by JoshuaKGoldberg [in this
comment](#1917 (comment))

---------

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -397,6 +397,13 @@
 			"avatar_url": "https://avatars.githubusercontent.com/u/105541001?v=4",
 			"profile": "https://github.com/astrochemx",
 			"contributions": ["code"]
+		},
+		{
+			"login": "birkskyum",
+			"name": "Birk Skyum",
+			"avatar_url": "https://avatars.githubusercontent.com/u/74932975?v=4",
+			"profile": "https://github.com/birkskyum",
+			"contributions": ["ideas"]
 		}
 	],
 	"contributorsPerLine": 7,