[v11.2.x] API Docs: create Authentication page and order sidebar menu (#93019)

API Docs: create `Authentication` page and order sidebar menu (#92900)

* API Docs: create `Authentication` page and order sidebar menu

* fix minor typos

* Update capitalization

We don't capitalize titles as per https://grafana.com/docs/writers-toolkit/write/style-guide/capitalization-punctuation/

* Update docs/sources/developers/http_api/examples/_index.md

Co-authored-by: Jack Baldry <jack.baldry@grafana.com>

* Update docs/sources/developers/http_api/authentication.md

Co-authored-by: Jack Baldry <jack.baldry@grafana.com>

---------

Co-authored-by: Irene Rodriguez <irene.rodriguez@grafana.com>
Co-authored-by: Jack Baldry <jack.baldry@grafana.com>
(cherry picked from commit e87140bf75)

Co-authored-by: Pepe Cano <825430+ppcano@users.noreply.github.com>

docs/sources/developers/http_api/authentication.md

@@ -0,0 +1,23 @@
+---
+canonical: https://grafana.com/docs/grafana/latest/developers/http_api/authentication/
+description: 'You can authenticate HTTP API requests using basic authentication, a service account token, or a session cookie.'
+keywords:
+  - grafana
+  - http
+  - documentation
+  - api
+  - role-based-access-control
+  - acl
+  - enterprise
+labels:
+  products:
+    - enterprise
+    - oss
+title: Authentication options for the HTTP API
+menuTitle: Authentication
+weight: 01
+---
+
+# Authentication options for the HTTP API
+
+{{< docs/shared lookup="developers/authentication.md" source="grafana" version="<GRAFANA_VERSION>" >}}