🔧 웹훅 URL을 HTTPS로 수정

- 웹훅 URL을 https://admin.youtooplay.com/webhook로 변경
- Nginx 리버스 프록시 설정 파일 추가
- 배포 가이드 업데이트

@core/scss/base/placeholders/_nav.scss

@@ -0,0 +1,33 @@
+@use "@core/scss/base/mixins";
+
+// ℹ️ This is common style that needs to be applied to both navs
+%nav {
+  color: rgba(var(--v-theme-on-surface), var(--v-high-emphasis-opacity));
+
+  .nav-item-title {
+    letter-spacing: 0.15px;
+  }
+
+  .nav-section-title {
+    letter-spacing: 0.4px;
+  }
+}
+
+/*
+    Active nav link styles for horizontal & vertical nav
+
+    For horizontal nav it will be only applied to top level nav items
+    For vertical nav it will be only applied to nav links (not nav groups)
+*/
+%nav-link-active {
+  background-color: rgb(var(--v-theme-primary));
+  color: rgb(var(--v-theme-on-primary));
+
+  @include mixins.elevation(3);
+}
+
+%nav-link {
+  a {
+    color: inherit;
+  }
+}