docs: deployment overview (#7108)

* sidebars

* init

* more-content

* backend-only-dockerfile

* more-content

* postgres-page

* cleanup

* cleanup

* multiple-postgres-db

* move-content

* test

* spacing-issue

* remove-link-temporarily-for-build

* code-review

* add-note-for-readOnlyRootFilesystem

* Apply suggestions from code review

Co-authored-by: KimberlyFields <46325568+KimberlyFields@users.noreply.github.com>

* rename-concepts-to-overview

* docs: Refactor deployment overview for clarity and conciseness

* improve-sentence-add-comma-remove-trailing-spaces

* code-review

---------

Co-authored-by: KimberlyFields <46325568+KimberlyFields@users.noreply.github.com>

docs/sidebars.js

@@ -79,6 +79,7 @@ module.exports = {
         "Configuration/configuration-auto-saving",
         "Configuration/configuration-backend-only",
         "Configuration/configuration-cli",
+        "Configuration/configuration-custom-database",
         "Configuration/configuration-global-variables",
         "Configuration/environment-variables",
         "Configuration/configuration-security-best-practices"
@@ -88,11 +89,21 @@ module.exports = {
       type: "category",
       label: "Deployment",
       items: [
+        {
+          type:"doc",
+          id: "Deployment/deployment-overview",
+          label: "Deployment overview"
+        },
         {
           type: "doc",
           id: "Deployment/deployment-docker",
           label: "Docker"
         },
+        {
+          type: "doc",
+          id: "Deployment/deployment-kubernetes",
+          label: "Kubernetes"
+        },
         {
           type: "doc",
           id: "Deployment/deployment-gcp",
@@ -103,11 +114,6 @@ module.exports = {
           id: "Deployment/deployment-hugging-face-spaces",
           label: "Hugging Face Spaces"
         },
-        {
-          type: "doc",
-          id: "Deployment/deployment-kubernetes",
-          label: "Kubernetes"
-        },
         {
           type: "doc",
           id: "Deployment/deployment-railway",