DL-55: Fix the apache-rat check

- exclude the website directory as well as excluding docs directory
- remove the .gitmodules file (it seems to not be used anyway)

Author: jiazhai <zhaijia03@gmail.com>

Reviewers: Sijie Guo <sijie@apache.org>

Closes #31 from jiazhai/fix_apache_rat_check
diff --git a/.gitmodules b/.gitmodules
deleted file mode 100644
index ecfc44f..0000000
--- a/.gitmodules
+++ /dev/null
@@ -1,3 +0,0 @@
-[submodule "website/_plugins/jekyll-rst"]
-	path = website/_plugins/jekyll-rst
-	url = https://github.com/xdissent/jekyll-rst.git
diff --git a/pom.xml b/pom.xml
index f8e757d..1b771a3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -174,6 +174,7 @@
         <configuration>
           <excludes>
             <exclude>docs/**/*</exclude>
+            <exclude>website/**/*</exclude>
             <exclude>.git/**/*</exclude>
             <exclude>.gitignore</exclude>
             <exclude>.idea/**/*</exclude>