Update CONTRIBUTING.md (#983)

Fixes the contributing guidelines that imply that `prisma` CLI is globally installed. Uses `npx prisma` to use the same version of Prisma provided with Epic Stack. Generally, installing node modules globally is a bad idea and should be avoided.

Author: kettanaito

CONTRIBUTING.md

@@ -53,7 +53,7 @@ cp .env.example .env
 npm install
 
 # setup database
-prisma migrate reset --force
+npx prisma migrate reset --force
 
 # Install playwright browsers
 npm run test:e2e:install