fix: uploading and downloading pdf now works

.gitignore

package-lock.json

package.json

src/app.module.ts

src/config/config.model.ts

src/config/config.prod.json

src/config/config.template.json

src/config/index.ts

src/internships/dao/internships.dao.ts

src/internships/internships.controller.ts

src/main.ts

src/resources/resources.controller.ts

src/resources/resources.module.ts

src/shared/HttpError.ts