chore: favicon and old file rm

blog/templates/base.html

@@ -4,6 +4,8 @@
 <head>
   <meta charset="UTF-8">
   <title>{{.Title}}</title>
+  <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+  <link rel="alternate icon" href="/favicon.ico">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   {{if .Post.HTML}}
   <meta name="description" content="{{.Post.Description}}">