feat(init): 添加阿里云源初始化脚本

- 新增 linux-ali.sh 脚本
- 更新 README.md，添加阿里云源初始化说明
- 重命名 nginx 配置示例，从 git.sugarscat.cn 改为 example
- 更新 nginx 配置示例的 README.md

nginx/nginx.conf

@@ -50,14 +50,14 @@ http {
     ##
 
     gzip on;
-    gzip_min_length  1k;
-    gzip_buffers     4 16k;
+    gzip_min_length 1k;
+    gzip_buffers 4 16k;
     gzip_http_version 1.1;
     gzip_comp_level 2;
-    gzip_types     text/plain application/javascript application/x-javascript text/javascript text/css application/xml;
+    gzip_types text/plain application/javascript application/x-javascript text/javascript text/css application/xml;
     gzip_vary on;
-    gzip_proxied   expired no-cache no-store private auth;
-    gzip_disable   "MSIE [1-6]\.";
+    gzip_proxied expired no-cache no-store private auth;
+    gzip_disable "MSIE [1-6]\.";
 
     ##
     # Virtual Host Configs