issue #20: padronizacao dos nomes de arquivos e tabelas do banco de dados

src/db/relations/collection-like.relation.ts

src/db/relations/collection-resource.relation.ts

src/db/relations/followers.relation.ts

src/db/relations/notification.relation.ts

src/db/relations/resource-educational-stage.relation.ts

src/db/relations/resource-language.relation.ts

src/db/relations/resource-like.relation.ts

src/db/relations/resource-subject.relation.ts

src/db/relations/user-achievement.relation.ts

src/db/relations/user-institution.relation.ts

src/db/relations/user-item.relation.ts

src/db/relations/user-role.relation.ts

src/db/repo/achievement.repo.ts

src/db/repo/collection-likes.repo.ts

src/db/repo/collection-resources.repo.ts

src/db/repo/collections.repo.ts

src/db/repo/complaint.repo.ts

src/db/repo/educational-stage.repo.ts

src/db/repo/follow.repo.ts

src/db/repo/institutions.repo.ts