website/docs: docs about initial perms (#14263)

* basic procedural steps

* more questions, more typos

* more typos

* tweaks

* more content, new links

* fixed link

* tweak

* fix things

* more fixes

* yet more fixes

* Apply suggestions from code review

Co-authored-by: Dewi Roberts <dewi@goauthentik.io>
Signed-off-by: Tana M Berry <tanamarieberry@yahoo.com>

* Update website/docs/users-sources/access-control/initial_permissions.mdx

Co-authored-by: Dewi Roberts <dewi@goauthentik.io>
Signed-off-by: Tana M Berry <tanamarieberry@yahoo.com>

* dewi's edits

* dominic's edits

* gergo edits and more dominic edits

* one more

* yet one more fix

* final gergo observation

* tweak

---------

Signed-off-by: Tana M Berry <tanamarieberry@yahoo.com>
Co-authored-by: Tana M Berry <tana@goauthentik.io>
Co-authored-by: Dewi Roberts <dewi@goauthentik.io>

website/sidebars.js

@@ -495,6 +495,7 @@ export default {
                     items: [
                         "users-sources/access-control/permissions",
                         "users-sources/access-control/manage_permissions",
+                        "users-sources/access-control/initial_permissions",
                     ],
                 },
                 {