fix: replace border-gray-300 with a themable colour (#664)

Co-authored-by: Aman Harwara <amanharwara@protonmail.com>

app/assets/javascripts/components/Input.tsx

@@ -14,7 +14,7 @@ export const Input: FunctionalComponent<Props> = ({
   const base = `rounded py-1.5 px-3 text-input my-1 h-8 bg-contrast`;
   const stateClasses = disabled
     ? 'no-border'
-    : 'border-solid border-1 border-gray-300';
+    : 'border-solid border-1 border-neutral';
   const classes = `${base} ${stateClasses} ${className}`;
   return (
     <input type="text" className={classes} disabled={disabled} value={text} />