website/integrations: add coder (#14385)

* init

Signed-off-by: Dominic R <dominic@sdko.org>

* init

Signed-off-by: Dominic R <dominic@sdko.org>

* wip

* what is happening to my lint today?

* Apply suggestions from code review

Co-authored-by: Dewi Roberts <dewi@goauthentik.io>
Signed-off-by: Dominic R <dominic@sdko.org>

---------

Signed-off-by: Dominic R <dominic@sdko.org>
Co-authored-by: Dewi Roberts <dewi@goauthentik.io>

website/sidebars/integrations.mjs

@@ -80,6 +80,7 @@ const items = [
             "services/argocd/index",
             "services/awx-tower/index",
             "services/cloudflare-access/index",
+            "services/coder/index",
             "services/globalprotect/index",
             "services/harbor/index",
             "services/hashicorp-vault/index",