Add Bullet gem, update to Rails 5.2.2.1, refactor various form helpers, and add to Resources

• Add Bullet gem to improve query performance by @gabrielpedepera and @marcellalcantara
• Refactor MomentsHelper and create MomentsFormHelper by @julianguyen
• Refactor MedicationsHelper and create MedicationsFormHelper by @julianguyen
• Add MomentsFormHelper tests by @julianguyen
• Update TargetRubyVersion to 2.4 (2.6 does not exist) by @julianguyen
• Bump ruby version in Dockerfile by @gabrielpedepera
• [Security] Bump rails from 5.2.2 to 5.2.2.1 by @dependabot-bot
• Add Therapy for Latinx to Resources and improve tags by @julianguyen