add references to generic source and provider sections

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

website/integrations/services/index.mdx

@@ -8,6 +8,8 @@ import { useCurrentSidebarCategory } from "@docusaurus/theme-common";
 
 Below is a list of all applications that are known to work with authentik.
 
+The pages in this section describe integrations with various other applications, see [Providers](../../docs/providers).
+
 All integrations will have a combination of these badges:
 
 -   <span class="badge badge--secondary">Support level: Community</span>

website/integrations/sources/index.mdx

@@ -7,6 +7,8 @@ import { useCurrentSidebarCategory } from "@docusaurus/theme-common";
 
 Below is a list of all sources that are known to work with authentik.
 
+The pages in this section describe integrations with various other applications, see [Sources](../../docs/sources).
+
 All integrations will have a combination of these badges:
 
 -   <span class="badge badge--secondary">Support level: Community</span>

website/sidebars.js

@@ -59,6 +59,12 @@ const docsSidebar = {
         {
             type: "category",
             label: "Providers",
+            link: {
+                type: "generated-index",
+                title: "Providers",
+                slug: "providers",
+                description: "Overview of all available provider types",
+            },
             items: [
                 {
                     type: "category",