fix: remove deprecated config.server.base (#13482)

Author: fi3ework

docs/config/server-options.md

@@ -247,12 +247,6 @@ async function createServer() {
 createServer()
 ```
 
-## server.base
-
-- **Type:** `string | undefined`
-
-Prepend this folder to http requests, for use when proxying vite as a subfolder. Should start with the `/` character.
-
 ## server.fs.strict
 
 - **Type:** `boolean`

packages/vite/src/node/server/index.ts

@@ -94,11 +94,6 @@ export interface ServerOptions extends CommonServerOptions {
    * @default false
    */
   middlewareMode?: boolean | 'html' | 'ssr'
-  /**
-   * Prepend this folder to http requests, for use when proxying vite as a subfolder
-   * Should start and end with the `/` character
-   */
-  base?: string
   /**
    * Options for files served via '/\@fs/'.
    */