feat: bump to our own image machinery

See https://git.coopcloud.tech/coop-cloud-chaos-patchs/docker-writefreely

README.md

@@ -6,7 +6,7 @@
 
 * **Category**: Apps
 * **Status**: 2, beta
-* **Image**: [`writeas/writefreely`](https://hub.docker.com/r/writeas/writefreely), 4, upstream
+* **Image**: [`writefreely`](https://git.coopcloud.tech/coop-cloud-chaos-patchs/docker-writefreely), 1, Co-op Cloud custom image
 * **Healthcheck**: 3
 * **Backups**: 1
 * **Email**: 3

compose.yml

@@ -3,7 +3,7 @@ version: "3.8"
 
 services:
   app:
-    image: "writeas/writefreely:latest"
+    image: git.coopcloud.tech/coop-cloud-chaos-patchs/writefreely:v0.15.1
     environment:
       - DB_PASSWORD_FILE=/run/secrets/db_password
       - FEDERATION