CRUD-V1-10. 삭제기능 만들기

1. 상세보기에서 삭제버튼

    <!-- 수정삭제버튼 -->
    <div class="d-flex justify-content-end">
        <a href="/board/{{model.id}}/update-form" class="btn btn-warning me-1">수정</a>
        <form action="/board/{{model.id}}/delete" method="post">
            <button class="btn btn-danger">삭제</button>
        </form>
    </div>

2. 삭제요청을 받고 db에서 삭제

   @PostMapping("/board/{id}/delete")
    public String delete(@PathVariable("id") int id) {
        boardRepository.deleteById(id);
        return "redirect:/board";
    }