use bools and numbers in config instead of parsing from string

config/config.example.yml

@@ -2,19 +2,19 @@ app:
     name: Pangolin
     base_url: http://localhost:3000
     log_level: warning
-    save_logs: "false"
+    save_logs: false
 
 server:
-    external_port: "3000"
-    internal_port: "3001"
+    external_port: 3000
+    internal_port: 3001
     internal_hostname: pangolin
-    secure_cookies: "true"
+    secure_cookies: true
 
 traefik:
-    cert_resolver: "letsencrypt"
-    http_entrypoint: "web"
-    https_entrypoint: "websecure"
+    cert_resolver: letsencrypt
+    http_entrypoint: web
+    https_entrypoint: websecure
 
 rate_limit:
-    window_minutes: "1"
-    max_requests: "100"
+    window_minutes: 1
+    max_requests: 100