Delete unnecessary files (#332)

diff --git a/public/categories/index.xml b/public/categories/index.xml
deleted file mode 100644
index 1c969ce..0000000
--- a/public/categories/index.xml
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
-  <channel>
-    <title>Categories on </title>
-    <link>/categories/</link>
-    <description>Recent content in Categories on </description>
-    <generator>Hugo -- gohugo.io</generator>
-
-  <atom:link href="/categories/index.xml" rel="self" type="application/rss+xml" />
-
-
-  </channel>
-</rss>
diff --git a/public/index.xml b/public/index.xml
deleted file mode 100644
index dbded23..0000000
--- a/public/index.xml
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
-  <channel>
-    <title></title>
-    <link>/</link>
-    <description>Recent content on </description>
-    <generator>Hugo -- gohugo.io</generator>
-
-  <atom:link href="/index.xml" rel="self" type="application/rss+xml" />
-
-
-  </channel>
-</rss>
diff --git a/public/sitemap.xml b/public/sitemap.xml
deleted file mode 100644
index e32577b..0000000
--- a/public/sitemap.xml
+++ /dev/null
@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
-  xmlns:xhtml="http://www.w3.org/1999/xhtml">
-
-  <url>
-    <loc>/</loc>
-  </url>
-
-  <url>
-    <loc>/categories/</loc>
-  </url>
-
-  <url>
-    <loc>/tags/</loc>
-  </url>
-
-</urlset>
diff --git a/public/tags/index.xml b/public/tags/index.xml
deleted file mode 100644
index dda0d9e..0000000
--- a/public/tags/index.xml
+++ /dev/null
@@ -1,13 +0,0 @@
-<?xml version="1.0" encoding="utf-8" standalone="yes" ?>
-<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
-  <channel>
-    <title>Tags on </title>
-    <link>/tags/</link>
-    <description>Recent content in Tags on </description>
-    <generator>Hugo -- gohugo.io</generator>
-
-  <atom:link href="/tags/index.xml" rel="self" type="application/rss+xml" />
-
-
-  </channel>
-</rss>