Add example 3 of configuration

Author: tcompa

examples/config_3_with_domain_and_https/fractal_server.md

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+
+`.fractal_server.env` file
+```bash
+DEPLOYMENT_TYPE=testing
+JWT_SECRET_KEY=XXX
+JWT_EXPIRE_SECONDS=80000
+DB_ENGINE=postgres
+POSTGRES_USER=XXX
+POSTGRES_HOST=XXX
+POSTGRES_DB=XXX
+FRACTAL_TASKS_DIR=/some/folder
+FRACTAL_LOGGING_LEVEL=20
+FRACTAL_RUNNER_BACKEND=slurm
+FRACTAL_RUNNER_WORKING_BASE_DIR=/some/other/folder
+FRACTAL_SLURM_CONFIG_FILE=/some/file.json
+FRACTAL_ADMIN_DEFAULT_EMAIL=XXX
+FRACTAL_ADMIN_DEFAULT_PASSWORD=XXX
+```
+
+Startup command:
+```bash
+gunicorn fractal_server.main:app --workers 8 --worker-class uvicorn.workers.UvicornWorker --bind $DOMAIN:$FRACTAL_SERVER_PORT --access-logfile server_logs/fractal-server.out --error-logfile server_logs/fractal-server.err
+```
+where for instance `DOMAIN=my.domain.ch` and `FRACTAL_SERVER_PORT=8000`.
+
+Alternative startup command:
+```bash
+fractalctl start --host $DOMAIN --port $FRACTAL_SERVER_PORT
+```
+

examples/config_3_with_domain_and_https/fractal_web.md

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+
+Notes:
+* `DOMAIN=my.domain.ch` (for instance)
+* `FRACTAL_SERVER_PORT=8000` (for instance) is the fractal-server port
+* `FRACTAL_WEB_PORT=5173` (for instance) is the fractal-web port (exposed via apache)
+
+1. `.env` file (replace as appropriate):
+```bash
+FRACTAL_SERVER_HOST=http://$DOMAIN:$FRACTAL_SERVER_PORT
+# AUTH COOKIE
+AUTH_COOKIE_NAME=fastapiusersauth
+AUTH_COOKIE_SECURE=false
+AUTH_COOKIE_DOMAIN=$DOMAIN
+AUTH_COOKIE_PATH=/
+AUTH_COOKIE_MAX_AGE=1800
+AUTH_COOKIE_SAME_SITE=lax
+AUTH_COOKIE_HTTP_ONLY=true
+```
+
+2. Build via
+```bash
+npm run build
+```
+
+3. Run via
+```
+PROTOCOL_HEADER=x-forwarded-proto HOST_HEADER=x-forwarded-host ORIGIN=https://$DOMAIN PORT=$FRACTAL_WEB_PORT node build