Extract complex npm scripts to separate files

scripts/backend:run.sh

@@ -0,0 +1,10 @@
+cd backend 
+dotenv -e ../deployment/.env -- \
+    ../.venv/bin/uvicorn main:app \
+    --host 127.0.0.1 \
+    --port 8300 \
+    --reload \
+    --reload-exclude './alembic' \
+    --reload-exclude './alembic/*' \
+    --reload-exclude './alembic/versions/*' \
+    --access-log

scripts/generate:env.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+echo > deployment/.env
+
+./.venv/bin/python3 backend/generate_vapid_keys.py >> deployment/.env
+
+cat >> deployment/.env <<EOF
+JWT_SECRET="$(openssl rand -base64 32)"
+TURN_USERNAME=<set>
+TURN_SECRET=<set>
+EOF