website/integrations: add filerise (#14610)

* Added filerise doc and updated integrations sidebar

* WIP

* Completed filerise instructions

* Minor wording fixes

* Applied suggestions from Dominic

* Clarified admin icon step.

* Update website/integrations/services/filerise/index.mdx

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

* Update website/integrations/services/filerise/index.mdx

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

* Missing .

* Update website/integrations/services/filerise/index.mdx

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

* Update website/integrations/services/filerise/index.mdx

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

---------

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

website/sidebars/integrations.mjs

@@ -133,6 +133,7 @@ const items = [
             "services/adventurelog/index",
             "services/calibre-web/index",
             "services/engomo/index",
+            "services/filerise/index",
             "services/frappe/index",
             "services/freshrss/index",
             "services/gravitee/index",