Refactors Articles and Voter

- Move files into components (article)
- Split articles routes
- Refactoring for remove ktor-voter (ArticleVoter)
- Remove mutability
- Move DataConversion to separate file (Converter.kt)
- Add Schemas for Articles routes
- Fix SQL Query for Workgroup roles
- rename container_name in docker-compose

src/main/kotlin/utils/DateTime.kt

@@ -3,4 +3,4 @@ package fr.dcproject.utils
 import org.joda.time.DateTime
 import org.joda.time.format.ISODateTimeFormat
 
-fun DateTime.toIso() = ISODateTimeFormat.dateTime().print(this)
+fun DateTime.toIso(): String = ISODateTimeFormat.dateTime().print(this)