Add init support of orgmode document type on file view and readme (#2525)

* add init support of orgmode document type on file view and readme

* fix imports

* fix imports and readmeExist

* fix imports order

* fix format

* remove unnecessary convert

modules/markup/markup_test.go

@@ -7,8 +7,8 @@ package markup_test
 import (
 	"testing"
 
-	_ "code.gitea.io/gitea/modules/markdown"
 	. "code.gitea.io/gitea/modules/markup"
+	_ "code.gitea.io/gitea/modules/markup/markdown"
 
 	"github.com/stretchr/testify/assert"
 )