ci: Inline Cloudflare Pages project name

Replace vars.CLOUDFLARE_PROJECT_NAME with the literal project name the
workflow already deploys to. The variable was scoped to a single
environment, so it silently resolves to empty in any other environment.
Matches facioquo/schemas deploy.yml.

Author: DaveSkender

.github/workflows/deploy-website.yml

@@ -69,4 +69,4 @@ jobs:
           wranglerVersion: "latest"
           command: >
             pages deploy docs/_site
-            --project-name=${{ vars.CLOUDFLARE_PROJECT_NAME }}
+            --project-name=stock-indicators-python