Adds basic support for running locally without gcs creds

Checks-in "featured-background.jpeg" and cleans up sync.py and DEVELOPMENT.md
Add git ignores for node_modules and "generated" version-switcher.js

.gitignore

 resources/
 public/
 package-lock.json
+node_modules/
+assets/js/version-switcher.js

DEVELOPMENT.md

 # Developing the Tekton website
 
-- [Setting up your dev environment](#setup)
-- [Running locally](#running-locally)
-- [tekton.dev](#tekton.dev)
+- [Developing the Tekton website](#developing-the-tekton-website)
+  - [Running Locally](#running-locally)
+  - [tekton.dev](#tektondev)
 
 ## Running Locally
 
@@ -36,13 +36,12 @@ To run the [Makefile](Makefile) you will need more dependencies and flags:
 
 To run the makefile locally, you'll have to set the env var:
 
-* `SKIP_BACKGROUND` (see [#38](https://github.com/tektoncd/website/issues/38)) to avoid having to supply GCP credentials
 * [`DEPLOY_PRIME_URL`](https://docs.netlify.com/configure-builds/environment-variables/) to the path to your website files
 
 For example:
 
 ```bash
-SKIP_BACKGROUND=1 DEPLOY_PRIME_URL=localhost make preview-build
+DEPLOY_PRIME_URL=localhost make preview-build
 ```
 
 ## tekton.dev

sync/sync.py

@@ -20,18 +20,9 @@ TEMPLATE_DIR = './templates'
 VAULT_DIR = './content/en/vault'
 BUCKET_NAME = 'tekton-website-assets'
 
-SKIP_BACKGROUND = os.environ.get('SKIP_BACKGROUND')
 GCP_NETLIFY_ENV_CRED = os.environ.get('GCP_CREDENTIAL_JSON')
 GCP_PROJECT = os.environ.get('GCP_PROJECT')
 
-if not SKIP_BACKGROUND:
-    if GCP_NETLIFY_ENV_CRED:
-        credentials = service_account.Credentials.from_service_account_info(json.loads(GCP_NETLIFY_ENV_CRED))
-        gcs_client = storage.Client(project=GCP_PROJECT,
-                                    credentials=credentials)
-    else:
-        gcs_client = storage.Client()
-    gcs_bucket = gcs_client.get_bucket(BUCKET_NAME)
 jinja_env = Environment(loader=FileSystemLoader(TEMPLATE_DIR))
 
 
@@ -103,12 +94,6 @@ def prepare_vault_landing_page(component_versions):
         f.write(md)
 
 
-def download_background_image():
-    if not SKIP_BACKGROUND:
-        blob = gcs_bucket.blob('featured-background.jpeg')
-        blob.download_to_filename('./content/en/featured-background.jpeg')
-
-
 def scan(dir_path):
     entries = os.scandir(dir_path)
     sync_config_paths = []
@@ -132,4 +117,3 @@ if __name__ == '__main__':
     component_versions = get_component_versions(sync_configs)
     prepare_version_switcher_script(component_versions)
     prepare_vault_landing_page(component_versions)
-    download_background_image()