update images not part of chart, remove obs env file reference

vs_starter/templates/docker-compose.instance.yml

-version: "3.6"
+version: "3.8"
 services:
 {%- if environment != "dev" %}
   database:
@@ -188,7 +188,7 @@ services:
       placement:
         constraints: [node.role == manager]
   sftp:
-    image: registry.gitlab.eox.at/esa/prism/vs/pvs_sftp:release-2.0.0
+    image: registry.gitlab.eox.at/esa/prism/sftp:1.0.0
     deploy:
       placement:
         constraints: [node.role == manager]
@@ -258,7 +258,7 @@ services:
           - node.labels.type == internal
 {%- endif %}
   shibauth-{{slug}}:
-    image: registry.gitlab.eox.at/esa/prism/vs/pvs_shibauth:release-2.0.0
+    image: registry.gitlab.eox.at/esa/prism/shibauth:1.0.0
     environment:
       APACHE_SERVERNAME: "https://sso.{{slug}}.pass.copernicus.eu:443"
       USER_CATEGORY_ALLOW_RENDERER: "{{shibauth_renderer}}"

vs_starter/templates/docker-compose.yml

-version: "3.6"
+version: "3.8"
 services:
   database:
     image: mdillon/postgis:10
@@ -39,8 +39,7 @@ services:
       - ./config/{{slug}}/{{slug}}.env
       - ./config/{{slug}}/{{slug}}_db.env
       - ./config/{{slug}}/{{slug}}_django.env
-      - ./config/{{slug}}/{{slug}}_obs.env
-    secrets:
+     secrets:
       - DJANGO_PASSWORD
       - OS_PASSWORD_{{slug | upper}}
       - DJANGO_SECRET_KEY
@@ -109,8 +108,7 @@ services:
   preprocessor:
     env_file:
       - ./config/{{slug}}/{{slug}}.env
-      - ./config/{{slug}}/{{slug}}_obs.env
-    secrets:
+     secrets:
       - OS_PASSWORD_{{slug | upper}}
       - OS_PASSWORD_DOWNLOAD
     environment:
@@ -138,8 +136,7 @@ services:
     env_file:
       - ./config/{{slug}}/{{slug}}.env
       - ./config/{{slug}}/{{slug}}_db.env
-      - ./config/{{slug}}/{{slug}}_obs.env
-    secrets:
+     secrets:
       - DJANGO_PASSWORD
       - OS_PASSWORD_{{slug | upper}}
       - DJANGO_SECRET_KEY