Rename build-website task/job

In preparation for adding a similar task for atom packages

concourse/tasks/build-vscode-website.yml

@@ -0,0 +1,16 @@
+inputs:
+- name: sts4
+- name: s3-manifest-yaml-vsix-snapshot
+- name: s3-boot-properties-vsix-snapshot
+- name: s3-boot-java-vsix-snapshot
+- name: s3-concourse-vsix-snapshot
+- name: s3-bosh-vsix-snapshot
+outputs:
+- name: website
+platform: linux
+image_resource:
+  type: docker-image
+  source:
+    repository: kdvolder/sts4-build-env
+run:
+  path: "sts4/concourse/tasks/build-website.sh"