Release v0.3.0

Web v0.3.0

• Start moving to golang backend. Please follow the instructions here before upgrading: https://github.com/wh1te909/tacticalrmm/blob/develop/docs/migration-0.3.0.md
• Finished adding graph history for all check types
• Fixed #234 (requires agent 1.2.0)
• Upgraded to Celery 5
• Pending actions / tasks/ automation fixes
• Docker dev improvements

Agent v1.2.0

• start moving away from http requests and move to sockets with nats for agent checkin/checks to improve stability and reduce load on rmm