chore(lint): drop removed prefer-arrow-callback rule

oxlint 1.63 removed prefer-arrow-callback from the eslint plugin.
With the deps bump in this branch (oxlint 1.56 -> 1.63), the rule no
longer resolves and `pnpm check` errors out before linting any files.

Author: maxholman

website/.oxlintrc.json

@@ -18,7 +18,6 @@
 
 		// testing this for pure functions
 		"func-style": ["error", "declaration", { "allowArrowFunctions": true }],
-		"prefer-arrow-callback": "error",
 
 		// JavaScript allows the omission of curly braces when a block contains only one statement. However, it is considered by many to be best practice to never omit curly braces around blocks, even when they are optional, because it can lead to bugs and reduces code clarity. So the following:
 		"curly": ["error", "all"],