docs: add k3s pack doc (#1792)

* started k3s pack document

* added parameter section

* add terraform section

* docs: add instructions on how to configure OIDC

* add OIDC configuration instructions

* add logo and spectro proxy reference

* tweak intro paragraph

* address vale comments

* added another parameter table for virtual clusters

* fix punctuation

* address some review comments and refactor

* Apply suggestions from code review

Co-authored-by: Rita Watson <117382432+ritawatson@users.noreply.github.com>
Co-authored-by: Karl Cardenas <karl@spectrocloud.com>

* Update docs/docs-content/integrations/k3s.md

Co-authored-by: Rita Watson <117382432+ritawatson@users.noreply.github.com>

* add Okta to accepted terms

* add clarification about palette as IDP

* clarify how to identify a user as a subject when creating role bindings with palette IDP

* modify configurations

* update terms

* add older versions

* Apply suggestions from code review

Co-authored-by: Karl Cardenas <karl@spectrocloud.com>
Co-authored-by: Rita Watson <117382432+ritawatson@users.noreply.github.com>

* add review comments to other versions

---------

Co-authored-by: Lenny Chen <lenny.chen@spectrocloud.com>
Co-authored-by: Rita Watson <117382432+ritawatson@users.noreply.github.com>
Co-authored-by: Karl Cardenas <karl@spectrocloud.com>
(cherry picked from commit 7fcadb1)

docs/docs-content/clusters/cluster-management/cluster-rbac.md

@@ -147,7 +147,7 @@ Select the tab for your specific role scope to learn how to create the appropria
 3. Fill out the following details:
 
   * Role Name: Define a custom role name to identify the cluster role.
-  * Subjects: Subjects are a group of users, services, or teams using the Kubernetes API. 
+  * Subjects: Subjects are a group of users, services, or teams using the Kubernetes API. If you are using Palette as your IDP, you can use the Palette user's registration email address to identify the user.
   * Subject Name: Custom name to identify a subject.