Clean old deployment directories (#1321)

Fix #1300
```sh
cd $(RELEASES_DIR) && \
ls -1dt */ |                         # list dirs by modification time
grep -v "^current/?$$" |             # skip the 'current' symlink
grep -v "^$(TIMESTAMP)/$$" |         # skip the one we just deployed
tail -n +4 |                         # keep the latest 3
xargs -r echo rm -rf                 # delete the rest (dry-mode with echo)
```

with "echo" in the command it's dry-mode

example output

![image](https://github.com/user-attachments/assets/934352c5-61f6-4c79-bb90-8a923feed622)

---------

Co-authored-by: Mia Bajić <[email protected]>

Author: nikoshell

Makefile

@@ -57,6 +57,16 @@ preview:
 	$(REMOTE_CMD) "cd $(RELEASES_DIR) && ln -snf $(TIMESTAMP) current"
 	@echo "\n\n**** Preview complete.\n\n"
 	@echo "Open the preview site at: $(PREVIEW_SITE_URL)\n\n"
+	@echo "\n**** Cleaning up old releases (keep latest 1, skip 'current')...\n"
+	$(REMOTE_CMD) "bash -c '\
+cd $(RELEASES_DIR) && \
+echo \"[INFO] Cleaning:\" && \
+ls -1dt */ \
+  | sed \"s:/*\\\$$::\" \
+  | grep -v ^current\\\$$ \
+  | grep -v ^$(TIMESTAMP)\\\$$ \
+  | tail -n +2 \
+  | xargs -r -I{} echo rm -rf \"{}\"'"
 
 
 ifeq ($(FORCE_DEPLOY), true)