Add .env example, clear application.yaml

.env.example

@@ -0,0 +1,3 @@
+DATABASE_URL=jdbc:postgresql://localhost:5433/postgres
+DATABASE_USERNAME=username
+DATABASE_PASSWORD=password

src/main/resources/application.yaml

@@ -1,22 +1,3 @@
-jwt:
-  secret: ${JWT_SECRET}
-authorization:
-  roles:
-    - name: ROLE_USER
-      access-expiry: '1d'
-      refresh-expiry: '90d'
-      privileges:
-        - READ_PRIVILEGE
-    - name: ROLE_ADMIN
-      access-expiry: '30m'
-      refresh-expiry: '2h'
-      privileges:
-        - WRITE_PRIVILEGE
-        - CHANGE_PASSWORD_PRIVILEGE
-  hierarchy: |
-    ROLE_ADMIN > ROLE_USER
-  default-role: ROLE_USER
-
 spring:
   application:
     name: anyame-user-service