chore: rename environment variables files (#395)

* chore: rename environment variables files

* docs: update README.md about .env file

Author: yi-ge

.env renamed to .env.example

@@ -27,3 +27,7 @@ coverage
 *.njsproj
 *.sln
 *.sw?
+
+# Environment variables files
+/service/.env
+/.env

.gitignore

@@ -55,7 +55,7 @@ Comparison:
 [Details](https://github.com/Chanzhaoyu/chatgpt-web/issues/138)
 
 Switching Methods:
-1. Go to the `service/.env` file.
+1. Go to the `service/.env.example` file and copy the contents to the `service/.env` file.
 2. For `OpenAI API Key`, fill in the `OPENAI_API_KEY` field [(Get apiKey)](https://platform.openai.com/overview).
 3. For `Web API`, fill in the `OPENAI_ACCESS_TOKEN` field [(Get accessToken)](https://chat.openai.com/api/auth/session).
 4. When both are present, `OpenAI API Key` takes precedence.
@@ -266,7 +266,7 @@ PS: You can also run `pnpm start` directly on the server without packaging.
 
 #### Frontend webpage
 
-1. Modify `VITE_APP_API_BASE_URL` in `.env` at the root directory to your actual backend interface address.
+1. Refer to the root directory `.env.example` file content to create `.env` file, modify `VITE_APP_API_BASE_URL` in `.env` at the root directory to your actual backend interface address.
 2. Run the following command in the root directory and then copy the files in the `dist` folder to the root directory of your website service.
 
 [Reference information](https://cn.vitejs.dev/guide/static-deploy.html#building-the-app)

README.en.md

@@ -54,7 +54,7 @@
 [查看详情](https://github.com/Chanzhaoyu/chatgpt-web/issues/138)
 
 切换方式：
-1. 进入 `service/.env` 文件
+1. 进入 `service/.env.example` 文件，复制内容到 `service/.env` 文件
 2. 使用 `OpenAI API Key` 请填写 `OPENAI_API_KEY` 字段 [(获取 apiKey)](https://platform.openai.com/overview)
 3. 使用 `Web API` 请填写 `OPENAI_ACCESS_TOKEN` 字段 [(获取 accessToken)](https://chat.openai.com/api/auth/session)
 4. 同时存在时以 `OpenAI API Key` 优先
@@ -261,7 +261,7 @@ PS: 不进行打包，直接在服务器上运行 `pnpm start` 也可
 
 #### 前端网页
 
-1、修改根目录下 `.env` 内 `VITE_APP_API_BASE_URL` 为你的实际后端接口地址
+1、参考根目录下 `.env.example` 文件内容创建 `.env` 文件，修改 `VITE_APP_API_BASE_URL` 为你的实际后端接口地址
 
 2、根目录下运行以下命令，然后将 `dist` 文件夹内的文件复制到你网站服务的根目录下