docs: Update kind field in catalog-info.yaml (#271)

From https://open-edx-proposals.readthedocs.io/en/latest/processes/oep-0055/decisions/0001-use-backstage-to-support-maintainers.html#references:

# (Required) Acceptable Values: Component, Resource, System
# Use `Component` unless you know how backstage works and what the other kinds mean.

Author: feanil

catalog-info.yaml

@@ -2,7 +2,7 @@
 # https://open-edx-proposals.readthedocs.io/en/latest/processes/oep-0055-proc-project-maintainers.html
 
 apiVersion: backstage.io/v1alpha1
-kind: ""
+kind: Component
 metadata:
   name: "forum"
   description: "openedx forum app"