Merge branch '613-inactive-accounts' into 'dev'

src/configuration/config.ts

src/mailer/mail-templates/inactiveUser1.ejs

src/mailer/mail-templates/inactiveUser1.json

src/mailer/mail-templates/inactiveUser2.ejs

src/mailer/mail-templates/inactiveUser2.json

src/mailer/mail-templates/inactiveUser3.ejs

src/mailer/mail-templates/inactiveUser3.json

src/users/services/users.service.ts