Fix #4 Migrate "admin/index.en"
Fix #4 Migrate "admin/getting-started.en"
Fix #4 Migrate "reference/plugins/index.en"
Erase white space
Fix url syntax
Erase white space
Erase white space
Cleanup
Tidy format
Merge pull request #7 from masaori335/doc-ja_migrate-from-rst

Fix #4 Migration from trafficserver-doc-ja/trafficserver-doc-ja