chore: Use only main branch for ci/cd, make deploy step manual

.gitlab-ci.yml

@@ -6,7 +6,7 @@ stages:
 variables:
   ENV_FILE: ".env"
 
-deploy_to_remote_server:
+deployment:
   stage: deploy
   tags:
     - python
@@ -45,4 +45,5 @@ deploy_to_remote_server:
     # Make run script executable
     - ssh $SERVER_USER@$SERVER_IP "chmod 755 $HOME_DIR/run_ADASMELIAE.sh"
   only:
-    - release
+    - main
+  when: manual

README.md

@@ -92,3 +92,7 @@ _Warning status example. Showing Europe and the surrounding areas._
 ![Temperature example. Showing Europe and the surrounding areas](./layer_example_temperature.png)
 
 _Temperature example. Showing Europe and the surrounding areas._
+
+## CI/CD
+
+The project contains one long-living branch: `main`. Deployment to the server can be performed by triggering the manual step `deployment` in the Gitlab pipeline.