Update conceptual info about docs.json (#822)

* update intro

* add conceptual content

* fill empty ResponseFields

* remove redundant section

* update title, description, intro

* update setting up your `docs.json`

* update customization reference

* navbar & navigation reference

* footer & banner

* redirects & contextual menu

* api ref

* SEO and search ref

* integrations & errors

* add example configs

* include `docs.json` as next step in quickstart

* remove space

* add reviewer feedback

Author: ethanpalm

quickstart.mdx

@@ -224,16 +224,19 @@ Enter your domain (for example, `docs.yourcompany.com`) and follow the provided
 
 Congratulations! You have successfully deployed your documentation site with Mintlify. Here are suggested next steps to enhance your documentation:
 
-<Card title="Customize Your Theme" icon="paintbrush" href="themes" horizontal>
+<Card title="Configure your global settings" icon="settings" href="settings" horizontal>
+  Configure site-wide styling, navigation, integrations, and more with the `docs.json` file.
+</Card>
+<Card title="Customize your theme" icon="paintbrush" href="themes" horizontal>
   Learn how to customize colors, fonts, and the overall appearance of your documentation site.
 </Card>
-<Card title="Organize Navigation" icon="map" href="navigation#overview" horizontal>
+<Card title="Organize navigation" icon="map" href="navigation" horizontal>
   Structure your documentation with intuitive navigation to help users find what they need.
 </Card>
-<Card title="Add Interactive Components" icon="puzzle" href="/components/accordions" horizontal>
+<Card title="Add interactive components" icon="puzzle" href="/components/accordions" horizontal>
   Enhance your documentation with interactive components like accordions, tabs, and code samples.
 </Card>
-<Card title="Set Up API References" icon="code" href="/api-playground/overview" horizontal>
+<Card title="Set up API references" icon="code" href="/api-playground/overview" horizontal>
   Create interactive API references with OpenAPI and AsyncAPI specifications.
 </Card>