Remove legacy references to FE that is not officially supported

config/config.exs

@@ -782,14 +782,6 @@ config :pleroma, :frontends,
         "https://akkoma-updates.s3-website.fr-par.scw.cloud/frontend/${ref}/admin-fe.zip",
       "ref" => "stable"
     },
-    "soapbox-fe" => %{
-      "name" => "soapbox-fe",
-      "git" => "https://gitlab.com/soapbox-pub/soapbox",
-      "build_url" =>
-        "https://gitlab.com/soapbox-pub/soapbox/-/jobs/artifacts/${ref}/download?job=build-production",
-      "ref" => "v2.0.0",
-      "build_dir" => "static"
-    },
     # For developers - enables a swagger frontend to view the openapi spec
     "swagger-ui" => %{
       "name" => "swagger-ui",

docs/docs/administration/CLI_tasks/frontend.md

@@ -21,7 +21,6 @@ Currently, known `<frontend>` values are:
 - [admin-fe](https://akkoma.dev/AkkomaGang/admin-fe)
 - [mastodon-fe](https://akkoma.dev/AkkomaGang/masto-fe)
 - [pleroma-fe](https://akkoma.dev/AkkomaGang/pleroma-fe)
-- [soapbox-fe](https://gitlab.com/soapbox-pub/soapbox-fe)
 
 You can still install frontends that are not configured, see below.