chore: Remove old frontend docs (#441)

* remove old frontend docs & clean up gh workflows

* remove images of old frontend

Author: labrenbe

.github/workflows/pr_cockpit.yml

@@ -7,7 +7,6 @@ on:
       - ".github/workflows/pr_cockpit.yml"
       - "rust/stackable-cockpitd/**"
       - "rust/stackable-cockpit/**"
-      - "docs/modules/cockpit/**"
       - "docs/modules/ROOT/**"
       - "Cargo.lock"
       - "deploy/**"

docs/antora.yml

@@ -3,5 +3,4 @@ name: management
 title: SDP Management
 version: "nightly"
 nav:
-  - modules/cockpit/nav.adoc
   - modules/stackablectl/nav.adoc

docs/modules/ROOT/pages/index.adoc

@@ -1,4 +1,3 @@
 = Management Tools for the Stackable Data Platform
 
-* xref:cockpit:index.adoc[]
 * xref:stackablectl:index.adoc[]