docs: redirect /guide to /guide/getting-started (#4276)

docs/public/_headers

@@ -1,6 +0,0 @@
-/assets/*
-  cache-control: max-age=31536000
-  cache-control: immutable
-
-/_translations/*
-  x-robots-tag: noindex

docs/public/_redirects

@@ -1 +0,0 @@
-https://vitepress.vuejs.org/* https://vitepress.dev/:splat 301!

netlify.toml

@@ -4,3 +4,24 @@
 [build]
   publish = "docs/.vitepress/dist"
   command = "pnpm docs:build && pnpm docs:lunaria:build"
+
+[[headers]]
+  for = "/assets/*"
+  [headers.values]
+    cache-control = '''
+    max-age=31536000,
+    immutable'''
+
+[[headers]]
+  for = "/_translations/*"
+  [headers.values]
+    x-robots-tag = "noindex"
+
+[[redirects]]
+  from = "https://vitepress.vuejs.org/*"
+  to = "https://vitepress.dev/:splat"
+  force = true
+
+[[redirects]]
+  from = "/guide/"
+  to = "/guide/getting-started"