fix: update script, docs and devcontainer

.devcontainer/on-create.sh

@@ -9,10 +9,5 @@ npm install
 # Copy the env file
 cp .env.example .env
 
-# Source the env file, export the variables
-set -a
-source .env
-set +a
-
 # Run the migrations
-npm run -w @documenso/prisma prisma:migrate-dev
+npm run prisma:migrate-dev