website/docs: sys mgmt: clean up certificates and add steps to download saml certs (#14497)

* website/docs: sys mgmt: clean up certificates and add steps to download
saml certs

* fix broken link

* Apply suggestions from code review

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

* Dewi review comments

* Update website/docs/sys-mgmt/certificates.md

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

* Apply suggestions from code review

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

* Update website/docs/sys-mgmt/certificates.md

Signed-off-by: Tana M Berry <tanamarieberry@yahoo.com>

* Update website/docs/sys-mgmt/certificates.md

Signed-off-by: Tana M Berry <tanamarieberry@yahoo.com>

* Update website/docs/sys-mgmt/certificates.md

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

* Update website/docs/sys-mgmt/certificates.md

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

* Update website/docs/sys-mgmt/certificates.md

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

* Update website/docs/sys-mgmt/certificates.md

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

* Update website/docs/sys-mgmt/certificates.md

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

* Update website/docs/sys-mgmt/certificates.md

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

* lint fix following header rm

---------

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

website/docs/core/architecture.md

@@ -37,7 +37,7 @@ This container executes background tasks, such as sending emails, the event noti
 
 #### Persistence
 
-- `/certs` is used for authentik to import external certs, which in most cases shouldn't be used for SAML, but rather if you use authentik without a reverse proxy, this can be used for example for the [Let's Encrypt integration](../sys-mgmt/certificates.md#lets-encrypt)
+- `/certs` is used for authentik to import external certs, which in most cases shouldn't be used for SAML, but rather if you use authentik without a reverse proxy, this can be used for example for the [Let's Encrypt integration](../sys-mgmt/certificates.md#lets-encrypt-integration)
 - `/templates` is used for [custom email templates](../add-secure-apps/flows-stages/stages/email/index.mdx#custom-templates), and as with the other ones fully optional
 
 ### PostgreSQL