Remove unnecessary files

src/main/resources/database_h2.conf

@@ -1,5 +0,0 @@
-db {
-  url = "jdbc:h2:${DatabaseHome};MVCC=true"
-  user = "sa"
-  password = "sa"
-}

src/main/resources/database_mysql.conf

@@ -1,5 +0,0 @@
-db {
-  url = "jdbc:mysql://192.168.99.100/gitbucket?useUnicode=true&characterEncoding=utf8"
-  user = "root"
-  password = "root"
-}

src/main/resources/database_postgresql.conf

@@ -1,5 +0,0 @@
-db {
-  url = "jdbc:postgresql://192.168.99.100/gitbucket"
-  user = "test"
-  password = "test"
-}