fix: restore icons and enhance technology stack

src/config/site.json

@@ -2,31 +2,31 @@
   {
     "name": "博客",
     "url": "https://blog.bsgun.cn",
-    "icon": "fa fa-blog"
+    "icon": "fas fa-blog"
   },
   {
     "name": "雨云",
     "url": "https://www.rainyun.com/Lin_",
-    "icon": "fa fa-cloud "
+    "icon": "fas fa-cloud"
   },
   {
     "name": "图床",
     "url": "https://dev.bsgun.cn",
-    "icon": "fa fa-image"
+    "icon": "fas fa-image"
   },
   {
     "name": "封面",
     "url": "https://cover.bsgun.cn",
-    "icon": "fa fa-panorama"
+    "icon": "fas fa-panorama"
   },
   {
     "name": "监测",
     "url": "https://status.bsgun.cn",
-    "icon": "fa fa-chart-line"
+    "icon": "fas fa-chart-line"
   },
   {
     "name": "图标",
     "url": "https://icon.bsgun.cn/",
-    "icon": "fa fa-icons"
+    "icon": "fas fa-icons"
   }
-]
+]