feat: improve UX for external configuration (#6861)

* docs: simplify traefik external tls

* remove pass host header

* docs: simplify and fix nginx external tls

* fix: readiness with enabled tls

* improve proxy docs

* improve proxy docs

* fix(ready): don't verify server cert

* complete nginx docs

* cleanup

* complete traefik docs

* add caddy docs

* simplify traefik

* standardize

* fix caddy

* add httpd docs

* improve external config docs

* guiding error message

* docs(defaults.yaml): remove misleading comments

* guiding error message cs and ru

* improve proxy testability

* fix compose up command

* improve commands

* fix nginx tls disabled

* fix nginx tls enabled

* fix: serve gateway when tls is enabled

* fmt caddy files

* fix caddy enabled tls

* remove not-working commands

* review

* fix checks

* fix link

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

e2e/config/localhost/docker-compose.yaml

@@ -22,7 +22,7 @@ services:
     ports:
     - "8080:8080"
     healthcheck:
-      test: ["CMD", "/app/zitadel", "ready"]
+      test: ["CMD", "/app/zitadel", "ready", "--config", "/zitadel.yaml" ]
       interval: '10s'
       timeout: '5s'
       retries: 5