feat: support removing config values via null

app/routes/_data.dns._index/nameservers.tsx

@@ -91,9 +91,9 @@ function NameserverList({ isGlobal, isDisabled, nameservers, name }: ListProps)
 									})
 								} else {
 									const key = `dns.nameservers.split."${name}"`
+									const list = nameservers.filter((_, i) => i !== index)
 									submit({
-										[key]: nameservers
-											.filter((_, i) => i !== index),
+										[key]: list.length ? list : null,
 									}, {
 										method: 'PATCH',
 										encType: 'application/json',

app/utils/config/headscale.ts

@@ -308,6 +308,11 @@ export async function patchConfig(partial: Record<string, unknown>) {
 
 		// Push the remaining element
 		path.push(temp.replaceAll('"', ''))
+		if (value === null) {
+			configYaml.deleteIn(path)
+			continue
+		}
+
 		configYaml.setIn(path, value)
 	}