Discourage spammers to send unsolicited messages to the team

[schlos]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like

Reduce unsolicited messages - block anonymous visitors from sending messages to the team to reduce spam messages being sent to volunteer team.

Describe alternatives you've considered

Additional context

[schlos]

Applied to imamopravoznati-0.39.0.0 branch:

• https://github.com/codeforcroatia/imamopravoznati-theme/commit/565c9495cffaa43daba39c06abf6deeb86a37126
• https://github.com/codeforcroatia/imamopravoznati-theme/commit/ef623f8a805c0401dcca78da866deb5acd657b34